Short bowel syndrome and intestinal failure Inflammatory bowel disease Gastroesophageal reflux disease and barrett Hypospadias and urolithiasis Acid related diseases GI endoscopy and video capsule endoscopy Sphincter sparing surgery for colorectal cancer Screening and therapeutic colonoscopy Minimally invasive surgery - flexible ureterorenoscopy Robotic and advanced laparoscopic urologic surgery Ureteropyeloscopy and laser lithotripsy Percutaneous nephrolithotomy Extracorporeal shock wave lithotripsy Complex gastrointestinal surgery and its risk factors