Eugene Minevich, MD

Professor of Clinical

Cincinnati Children's Hospital Medical Center
Division of Pediatric Urology
3333 Burnet Avenue
Cincinnati, Ohio 45229
Phone 513-636-4987
Email eugene.minevich@cchmc.org

Education

Medical Degree: Moscow Medical School 1985

General Surgery Residency: The Jewish Hospital of Cincinnati 1992 ( )

Urology Residency: University of Cincinnati 1996 ( )

Clinical Fellowship in Pediatric Urology: Cincinnati Children's Hospital Medical Center 1997 ( )

Research and Practice Interests

Pediatric Urology

Publications

Peer Reviewed Publications

Zaccaria L.;Fichtenbaum E.J.;Minevich E.A.;Schulte M.E.;Noh P.H.  (02-01-2020). Long-Term Follow-Up of Laparoendoscopic Single-Site Partial Nephrectomy for Nonfunctioning Moieties . Journal of Endourology, 34 (2) , 134-138More Information

Ahmed H.;Almomani M.;Strine A.C.;Reddy P.P.;Sheldon C.;Frischer J.;Breech L.;Minevich E.;Noh P.H.;VanderBrink B.A.  (01-01-2020). Clinical urologic and urodynamic outcomes in patients with anorectal malformation and absent vagina . Journal of Pediatric SurgeryMore Information

Strine A.;VanderBrink B.;May T.;Riazzi A.;Schulte M.;Noh P.;DeFoor W.;Minevich E.;Sheldon C.;Reddy P.  (10-01-2019). Impact of body mass index on 30-day postoperative morbidity in pediatric and adolescent patients und. Journal of Pediatric Urology, 15 (5) , 521.e1-521.e7More Information

Vanderbrink B.A.;Szymanski K.M.;Alam Z.;Misseri R.;Defoor W.R.;Kaefer M.;Reddy P.;Rink R.C.;Minevich E.;Cain M.P.  (09-01-2019). Risk of Reaugmentation after Enterocystoplasty Using a Reconfigured Bowel Segment in Patients with S. The Journal of urology, 202 (3) , 612-616More Information

Neheman A.;Kord E.;Strine A.;VanderBrink B.;Minevich E.;DeFoor W.;Reddy P.;Noh P.  (03-01-2019). Pediatric Partial Nephrectomy for Upper Urinary Tract Duplication Anomalies: A Comparison Between Di. Urology, 125, 196-201More Information

Smith M.C.;Strine A.C.;DeFoor W.R.;Minevich E.;Noh P.;Sheldon C.A.;Reddy P.P.;VanderBrink B.A.  (01-01-2019). Need for botulinum toxin injection and bladder augmentation after isolated bladder outlet procedure . Journal of Pediatric UrologyMore Information

Strine A.;VanderBrink B.;Riazzi A.;Schulte M.;Mayes T.;Noh P.;DeFoor W.;Minevich E.;Sheldon C.;Reddy P.  (12-01-2018). Preoperative nutritional status and use of total parenteral nutrition in pediatric and adolescent pa. Journal of Pediatric Urology, 14 (6) , 572.e1-572.e7More Information

Hong Y.;DeFoor W.;Reddy P.;Schulte M.;Minevich E.;VanderBrink B.;Noh P.  (03-01-2018). Hidden incision endoscopic surgery (HIdES) trocar placement for pediatric robotic pyeloplasty: compa. Journal of Robotic Surgery, 12 (1) , 43-47More Information

Reddy P.;Strine A.;Reddy T.;Noh P.;DeFoor W.;Minevich E.;Sheldon C.;VanderBrink B.  (08-01-2017). Triamcinolone injection for treatment of Mitrofanoff stomal stenosis: Optimizing results and reducin. Journal of Pediatric Urology, 13 (4) , 375.e1-375.e5More Information

Strine A.;VanderBrink B.;Alam Z.;Schulte M.;Noh P.;DeFoor W.;Minevich E.;Sheldon C.;Frischer J.;Reddy P.  (08-01-2017). Clinical and urodynamic outcomes in children with anorectal malformation subtype of recto-bladder ne. Journal of Pediatric Urology, 13 (4) , 376.e1-376.e6More Information

DeFoor W.;Reddy P.;Reed M.;VanderBrink B.;Jackson E.;Zhang B.;Denlinger J.;Noh P.;Minevich E.;Sheldon C.  (08-01-2017). Results of a prospective randomized control trial comparing hydrophilic to uncoated catheters in chi. Journal of Pediatric Urology, 13 (4) , 373.e1-373.e5More Information

Lee Z.;Schulte M.;Defoor W.;Reddy P.;Vanderbrink B.;Minevich E.;Liss Z.;Corbyons K.;Noh P.  (03-01-2017). A Non-Narcotic Pathway for the Management of Postoperative Pain Following Pediatric Robotic Pyelopla. Journal of Endourology, 31 (3) , 255-258More Information

Minevich E.;Lorenzo A.;DeFoor W.;Koyle M.  (11-25-2016). Pediatric renal tumors. Clinical Pediatric Nephrology: Third Edition, 993-1004More Information

Khan M.;VanderBrink B.;DeFoor W.;Minevich E.;Jackson E.;Noh P.;Reddy P.  (04-01-2016). Botulinum toxin injection in the pediatric population with medically refractory neuropathic bladder. Journal of Pediatric Urology, 12 (2) , 104.e1-104.e6More Information

Hawkins C.;Kukreja K.;Singewald T.;Minevich E.;Johnson N.;Reddy P.;Racadio J.  (04-01-2016). Use of cone-beam CT and live 3-D needle guidance to facilitate percutaneous nephrostomy and nephroli. Pediatric Radiology, 46 (4) , 570-574More Information

DeFoor W.;Rijhwani A.;Minevich E.  (04-24-2015). Urinary tract trauma. Pediatric Urology: Surgical Complications and Management: Second Edition, 364-373More Information

Cost N.;Liss Z.;Bean C.;Geller J.;Minevich E.;Noh P.  (01-01-2015). Prechemotherapy robotic-assisted laparoscopic radical nephrectomy for an adolescent with wilms tumor. Journal of Pediatric Hematology/Oncology, 37 (2) , e125-e127More Information

Riachy E.;Defoor W.;Reddy P.;Alam S.;Noh P.;Sheldon C.;Minevich E.  (01-01-2015). Endoscopic treatment with dextranomer/hyaluronic acid for persistent incontinence after continent ur. Journal of Endourology, 29 (2) , 137-140More Information

Defoor W.;Bischoff A.;Reddy P.;Vanderbrink B.;Minevich E.;Schulte M.;Sheldon C.;Peña A.  (01-01-2015). Chronic kidney disease stage progression in patients undergoing repair of persistent cloaca. Journal of Urology, 194 (1) , 190-194More Information

Bansal D.;Riachy E.;Robert Defoor W.;Reddy P.;Minevich E.;Alam S.;Noh P.  (05-01-2014). Pediatric varicocelectomy: A comparative study of conventional laparoscopic and laparoendoscopic sin. Journal of Endourology, 28 (5) , 513-516More Information

Bansal D.;Cost N.;Bean C.;Riachy E.;Defoor W.;Reddy P.;Minevich E.;Noh P.  (02-01-2014). Comparison of pediatric robotic-assisted laparoscopic nephroureterectomy and laparoendoscopic single. Urology, 83 (2) , 438-442More Information

Bansal D.;Cost N.;Bean C.;Minevich E.;Noh P.  (01-01-2014). Pediatric urological laparoendoscopic single site surgery: Single surgeon experience. Journal of Pediatric Urology, 10 (6) , 1170-1175More Information

Khandelwal P.;Brewer A.;Minevich E.;Miles L.;Geller J.  (01-01-2014). High-grade transitional cell carcinoma of the bladder in a 5-year-old boy successfully treated with . Journal of Pediatric Hematology/Oncology, 36 (4) More Information

Bansal D.;Cost N.;DeFoor W.;Reddy P.;Minevich E.;Vanderbrink B.;Alam S.;Sheldon C.;Noh P.  (01-01-2014). Infant robotic pyeloplasty: Comparison with an open cohort. Journal of Pediatric Urology, 10 (2) , 380-385More Information

Brady R.;Ruth N.;Minevich E.;Johnson N.;Passo M.  (11-01-2013). Severe back and pelvic pain in a 14-year-old boy. Infectious Diseases in Clinical Practice, 21 (6) , 377-379More Information

Bansal D.;Defoor W.;Reddy P.;Minevich E.;Noh P.  (01-01-2013). Complications of robotic surgery in pediatric urology: A single institution experience. Urology, 82 (4) , 917-921More Information

Riachy E.;Cost N.;Defoor W.;Reddy P.;Minevich E.;Noh P.  (01-01-2013). Pediatric standard and robot-assisted laparoscopic pyeloplasty: A comparative single institution stu. Journal of Urology, 189 (1) , 283-287More Information

Cost N.;Noh P.;Devarajan P.;Ivancic V.;Reddy P.;Minevich E.;Bennett M.;Haffner C.;Schulte M.;Defoor W.  (01-01-2013). Urinary NGAL levels correlate with differential renal function in patients with ureteropelvic juncti. Journal of Urology, 190 (4 SUPPL) , 1462-1467More Information

Minevich E.;Sheldon C.  (12-01-2012). Reconstruction of the Bladder and Bladder Outlet. Pediatric Surgery, 1467-1485More Information

Minevich E.;Sheldon C.  (09-11-2012). The pediatric genitourinary system. Greenfield's Surgery: Scientific Principles and Practice: Fifth Edition, 1946-1956

Korrect G.;Minevich E.;Sivan B.  (06-01-2012). High-grade transitional cell carcinoma of the pediatric bladder. Journal of Pediatric Urology, 8 (3) More Information

Traxel E.;Defoor W.;Minevich E.;Reddy P.;Alam S.;Reeves D.;Sheldon C.  (08-01-2011). Low incidence of urinary tract infections following renal transplantation in children with bladder a. Journal of Urology, 186 (2) , 667-671More Information

Minevich E.;Sheldon C.  (12-01-2010). Urinary Tract Infection and Vesicoureteral Reflux. Ashcraft's Pediatric Surgery, 716-730More Information

Minevich E.  (10-01-2010). Management of ureteric stone in pediatric patients. Indian Journal of Urology, 26 (4) , 564-567More Information

Ivan?i? V.;DeFoor W.;Jackson E.;Alam S.;Minevich E.;Reddy P.;Sheldon C.  (10-01-2010). Progression of renal insufficiency in children and adolescents with neuropathic bladder is not accel. Journal of Urology, 184 (4 SUPPL.) , 1768-1774More Information

Nguyen H.T.;Hurwitz R.S.;DeFoor W.R.;Minevich E.;McAdam A.J.;Mortensen J.E.;Novak-Weekley S.M.;Minnillo B.J.;Elder J.S.  (07-01-2010). Trimethoprim In Vitro Antibacterial Activity is Not Increased by Adding Sulfamethoxazole for Pediatr. Journal of Urology, 184 (1) , 305-310More Information

Alam S.;Minevich E.  (01-01-2010). Continent Catheterizable Reservoirs are Not Just for the Urinary Tract. Journal of Urology, 183 (1) , 15-16More Information

Traxel E.;Minevich E.;Noh P.  (01-01-2010). A review: The application of minimally invasive surgery to pediatric urology: Upper urinary tract pr. Urology, 76 (1) , 122-133More Information

Traxel E.;Minevich E.;Noh P.  (01-01-2010). A review: The application of minimally invasive surgery to pediatric urology: Lower urinary tract re. Urology, 76 (1) , 115-120More Information

DeFoor W.;Jackson E.;Minevich E.;Caillat A.;Reddy P.;Sheldon C.;Asplin J.  (01-01-2010). The risk of recurrent urolithiasis in children is dependent on urinary calcium and citrate. Urology, 76 (1) , 242-245More Information

DeFoor W.;Heshmat S.;Minevich E.;Reddy P.;Koyle M.;Sheldon C.  (06-01-2009). Long-Term Outcomes of the Neobladder in Pediatric Continent Urinary Reconstruction. Journal of Urology, 181 (6) , 2689-2694More Information

Minevich E.  (02-01-2009). Genitourinary emergencies in children. Minerva Pediatrica, 61 (1) , 53-65

Traxel E.;DeFoor W.;Reddy P.;Sheldon C.;Minevich E.  (01-01-2009). Risk factors for urinary tract infection after dextranomer/hyaluronic acid endoscopic injection. Journal of Urology, 182 (4 SUPPL.) , 1708-1713More Information

Heshmat S.;DeFoor W.;Minevich E.;Reddy P.;Reeves D.;Sheldon C.  (11-01-2008). Use of Customized MIC-KEY Gastrostomy Button for Management of MACE Stomal Complications. Urology, 72 (5) , 1026-1029More Information

DeFoor W.;Clark C.;Jackson E.;Reddy P.;Minevich E.;Sheldon C.  (10-01-2008). Risk Factors for End Stage Renal Disease in Children With Posterior Urethral Valves. Journal of Urology, 180 (4 SUPPL.) , 1705-1708More Information

DeFoor W.;Minevich E.;Jackson E.;Reddy P.;Clark C.;Sheldon C.;Asplin J.  (06-01-2008). Urinary Metabolic Evaluations in Solitary and Recurrent Stone Forming Children. Journal of Urology, 179 (6) , 2369-2372More Information

Sherafat-Kazemzadeh R.;Mehta S.N.;Care M.M.;Kim M.O.;Williams D.A.;Rose S.R.;Breech L.;Callen M.;Davies S.;Gluckman J.;Groh E.;Harris R.;Heist S.;Hillard P.;Hopkin R.;Kelly P.;Kiefhaber T.;Leslie N.;Mehlman C.;Meyer R.;Minevich E.;Mueller R.;Rutter M.;Schmid C.;Smith F.;Strife F.;Sutton M.;Walker M.;Williams D.;Wood R.;Yazigi N.  (08-01-2007). Small pituitary size in children with fanconi anemia. Pediatric Blood and Cancer, 49 (2) , 166-170More Information

Kitchens D.;DeFoor W.;Minevich E.;Reddy P.;Polsky E.;McGregor A.;Sheldon C.  (04-01-2007). End Cutaneous Ureterostomy for the Management of Severe Hydronephrosis. Journal of Urology, 177 (4) , 1501-1504More Information

Kitchens D.;Minevich E.;DeFoor W.;Reddy P.;Wacksman J.;Koyle M.;Sheldon C.  (01-01-2007). Incontinence Following Bladder Neck Reconstruction-Is There a Role for Endoscopic Management?. Journal of Urology, 177 (1) , 302-306More Information

Kitchens D.;Minevich E.;DeFoor W.;Reddy P.;Wacksman J.;Sheldon C.;Koyle M.  (10-01-2006). Endoscopic Injection of Dextranomer/Hyaluronic Acid Copolymer to Correct Vesicoureteral Reflux Follo. Journal of Urology, 176 (4 SUPPL.) , 1861-1863More Information

DeFoor W.;Asplin J.;Jackson E.;Jackson C.;Reddy P.;Sheldon C.;Erhard M.;Minevich E.  (10-01-2006). Urinary Metabolic Evaluations in Normal and Stone Forming Children. Journal of Urology, 176 (4 SUPPL.) , 1793-1796More Information

Minevich E.;Sheldon C.  (07-01-2006). The role of ureteroscopy in pediatric urology. Current Opinion in Urology, 16 (4) , 295-298More Information

Defoor W.;Ferguson D.;Mashni S.;Creelman L.;Reeves D.;Minevich E.;Reddy P.;Sheldon C.  (05-01-2006). Safety of Gentamicin Bladder Irrigations in Complex Urological Cases. Journal of Urology, 175 (5) , 1861-1864More Information

Minevich E.  (03-01-2006). Ureteral access sheath for the management of pediatric renal and ureteral stones: A single center ex. Journal of Urology, 175 (3) , 1082More Information

Minevich E.;Sheldon C.  (01-01-2006). Structural Disorders of the Bladder, Augmentation. Pediatric Surgery: Sixth Edition, 2-2, 1817-1840More Information

Minevich E.  (11-01-2005). Ureteroscopic or extracorporeal shock-wave lithotripsy for distal ureteral stones in children?: Comm. Nature Clinical Practice Urology, 2 (11) , 532-533More Information

DeFoor W.;Asplin J.;Jackson E.;Jackson C.;Reddy P.;Sheldon C.;Minevich E.  (01-01-2005). Results of a prospective trial to compare normal urine supersaturation in children and adults. Journal of Urology, 174 (4 II) , 1708-1710More Information

DeFoor W.;Minevich E.;Reddy P.;Barqawi A.;Kitchens D.;Sheldon C.;Koyle M.  (01-01-2005). Perforation of Malone antegrade continence enema: Diagnosis and management. Journal of Urology, 174 (4 II) , 1644-1646More Information

Minevich E.;DeFoor W.;Reddy P.;Nishinaka K.;Wacksman J.;Sheldon C.;Erhard M.  (01-01-2005). Ureteroscopy is safe and effective in prepubertal children. Journal of Urology, 174 (1) , 276-279More Information

DeFoor W.;Dharamsi N.;Smith P.;Sekhon D.;Colombo J.;Riden D.;Reddy P.;Sheldon C.;Minevich E.  (01-01-2005). Use of mobile extracorporeal shock wave lithotripter: Experience in a pediatric institution. Urology, 65 (4) , 778-781More Information

DeFoor W.;Minevich E.;Reddy P.;Sekhon D.;Polsky E.;Wacksman J.;Sheldon C.  (01-01-2004). Bladder calculi after augmentation cystoplasty: Risk factors and prevention strategies. Journal of Urology, 172 (5 I) , 1964-1966More Information

DeFoor W.;Minevich E.;Reddy P.;Polsky E.;McGregor A.;Wacksman J.;Sheldon C.;Perovic S.;Brock J.  (01-01-2004). Results of tapered ureteral reimplantation for primary megaureter: Extravesical versus intravesical . Journal of Urology, 172 (4 II) , 1640-1643More Information

DeFoor W.;Tackett L.;Minevich E.;Wacksman J.;Sheldon C.  (10-01-2003). Risk factors for spontaneous bladder perforation after augmentation cystoplasty. Urology, 62 (4) , 737-741More Information

DeFoor W.;Minevich E.;Reeves D.;Tackett L.;Wacksman J.;Sheldon C.;Rink R.  (10-01-2003). Gastrocystoplasty: Long-term followup. Journal of Urology, 170 (4 II) , 1647-1650More Information

DeFoor W.;Minevich E.;McEnery P.;Tackett L.;Reeves D.;Sheldon C.;Greenfield S.  (10-01-2003). Lower urinary tract reconstruction is safe and effective in children with end stage renal disease. Journal of Urology, 170 (4 II) , 1497-1500More Information

DeFoor W.;Minevich E.;Tackett L.;Yasar U.;Wacksman J.;Sheldon C.  (03-01-2003). Ectopic ureterocele: Clinical application of classification based on renal unit jeopardy. Journal of Urology, 169 (3) , 1092-1094More Information

Defoor W.;Tackett L.;Minevich E.;McEnery P.;Kitchens D.;Reeves D.;Sheldon C.  (01-01-2003). Successful renal transplantation in children with posterior urethral valves. Journal of Urology, 170 (6 I) , 2402-2404More Information

Battino B.;DeFoor W.;Coe F.;Tackett L.;Erhard M.;Wacksman J.;Sheldon C.;Minevich E.  (12-01-2002). Metabolic evaluation of children with urolithiasis: Are adult references for supersaturation appropr. Journal of Urology, 168 (6) , 2568-2571More Information

Defoor W.;Minevich E.;Sheldon C.  (11-01-2002). Unusual bladder masses in children. Urology, 60 (5) , 911

Bennett S.;Defoor W.;Minevich E.  (01-01-2002). Primary extrarenal nephrogenic rest. Journal of Urology, 168 (4 I) , 1529More Information

Minevich E.;Tackett L.;Wacksman J.;Sheldon C.  (01-01-2002). Extravesical common sheath detrusorrhaphy (Ureteroneocystotomy) and reflux in duplicated collecting . Journal of Urology, 167 (1) , 288-290More Information

Tackett L.;Wacksman J.;Billmire D.;Sheldon C.;Minevich E.  (01-01-2002). The high intra-abdominal testis: Technique and long-term success of laparoscopic testicular autotran. Journal of Endourology, 16 (6) , 359-361More Information

Tackett L.D.;Minevich E.;Benedict J.F.;Wacksman J.;Sheldon C.A.  (01-01-2002). Appendiceal versus ileal segment for antegrade continence enema. Journal of Urology, 167 (2 I) , 683-686

Minevich E.  (01-01-2001). Pediatric urolithiasis. Pediatric Clinics of North America, 48 (6) , 1571-1585More Information

Sheldon C.;Minevich E.;Wacksman J.  (01-01-2000). Modified technique of antegrade continence enema using a stapling device. Journal of Urology, 163 (2) , 589-591More Information

Tackett L.;Minevich E.;Wacksman J.;Sheldon C.  (01-01-2000). Holmium laser lithotripsy for ejaculatory duct calculi. Journal of Urology, 164 (6) , 2067More Information

Mardovin V.;Minevich E.;Nguyen S.;Wacksman J.;Sheldon C.  (01-01-2000). Bifid mesonephric duct presenting as a scrotal urinoma. Journal of Urology, 163 (3) , 944-945More Information

Gylys-Morin V.;Minevich E.;Tackett L.;Reichard E.;Wacksman J.;Sheldon C.  (01-01-2000). Magnetic resonance imaging of the dysplastic renal moiety and ectopic ureter. Journal of Urology, 164 (6) , 2034-2039More Information

Minevich E.;Sheldon C.  (01-01-1999). Gastrocystoplasty-ileal mitrofanoff stoma fistula. Journal of Urology, 161 (1) , 271More Information

Minevich E.;Pecha B.;Wacksman J.;Sheldon C.  (01-01-1999). Mathieu hypospadias repair: Experience in 202 patients. Journal of Urology, 162 (6) , 2141-2143More Information

Minevich E.;Moayed A.;Wacksman J.;Lewis A.;Sheldon C.  (01-01-1999). Unusual anatomic presentation of ectopic ureteroceles. Journal of Pediatric Surgery, 34 (3) , 474-476More Information

Minevich E.;Wacksman J.;Lewis A.;Sheldon C.  (01-01-1998). Incidence of contralateral vesicoureteral reflux following unilateral extravesical detrusorrhaphy (u. Journal of Urology, 159 (6) , 2126-2128More Information

Minevich E.;Aronoff D.;Wacksman J.;Sheldon C.  (01-01-1998). Voiding dysfunction after bilateral extravesical detrusorrhaphy. Journal of Urology, 160 (3 II) , 1004-1006More Information

Minevich E.;Wacksman J.;Lewis A.;Sheldon C.  (01-01-1998). Inguinal microsurgical varicocelectomy in the adolescent: Technique and preliminary results. Journal of Urology, 159 (3) , 1022-1024More Information

Sheldon C.;Minevich E.;Wacksman J.  (01-01-1997). A peel away sheath endoscopic technique for difficult pediatric urethral intubation problems. Journal of Urology, 157 (5) , 1880-1881More Information

Minevich E.;Wacksman J.;Lewis A.;Bukowski T.;Sheldon C.  (01-01-1997). The infected urachal cyst: Primary excision versus a staged approach. Journal of Urology, 157 (5) , 1869-1872More Information

Minevich E.;Rousseau M.;Wacksman J.;Lewis A.;Sheldon C.  (01-01-1997). Pediatric ureteroscopy: Technique and preliminary results. Journal of Pediatric Surgery, 32 (4) , 571-574More Information

Sheldon C.A.;Minevich E.;Wacksman J.;Lewis A.G.;Stevens P.S.  (01-01-1997). Role of the antegrade continence enema in the management of the most debilitating childhood rectouro. Journal of Urology, 158 (3 SUPPL.) , 1277-1280More Information

Minevich E.;Wacksman J.;Phipps L.;Lewis A.;Sheldon C.  (01-01-1997). The importance of accurate diagnosis early close followup in patients with suspected multicystic dys. Journal of Urology, 158 (3 SUPPL.) , 1301-1304More Information

Silver R.;Gros D.;Jeffs R.;Gearhart J.;DeJong T.;Rink R.;Cendron M.;Snyder H.;Klauber G.;Mesrobian H.;Minevich E.;Wacksman J.;Reddy P.;Brock J.;Stock J.;Broecker B.;McLorie G.;Duffy P.;Silver R.;Diamond D.;Carr M.;Khoury A.;Kramer S.  (01-01-1997). Urolithiasis in the exstrophy-epispadias complex. Journal of Urology, 158 (3 SUPPL.) , 1322-1326More Information

Contact Information

Academic - Cincinnati Children's Hospital Medical Center
Division of Pediatric Urology
Cincinnati  Ohio, 45229
Phone: 513-636-4987
eugene.minevich@cchmc.org