Intraoperative Complications/etiology; Kidney Transplantation; Postoperative Complications/etiology; Blood Loss, Surgical/prevention & control; Hemorrhage/etiology; Hemorrhage/prevention & control; Humans; Intraoperative Complications/epidemiology; Intraoperative Complications/prevention & control; Kidney/blood supply; Kidney Transplantation/adverse effects; Kidney Transplantation/methods; Lymphocele/etiology; Lymphocele/prevention & control; Postoperative Complications/epidemiology; Postoperative Complications/prevention & control; Surgical Wound Dehiscence/prevention & control; Surgical Wound Infection/prevention & control; Thrombosis/etiology; Thrombosis/prevention & control; Ureteral Obstruction/etiology; Ureteral Obstruction/prevention & control; Urinary Calculi/etiology; Urinary Calculi/prevention & control; Urinary Fistula/diagnosis; Urinary Fistula/etiology; Urinary Fistula/prevention & control; Vascular Diseases/etiology; Vascular Diseases/prevention & control; Vesico-Ureteral Reflux/etiology; Vesico-Ureteral Reflux/prevention & control