Bariatric Surgery / Treatment Outcome / Laparoscopic Surgery / Prospective studies / Humans / Female / Male / Young Adult / Gastric banding / Obesity Surgery / Clinical Sciences / Middle Aged / Adult / Public health systems and services research / SURGICAL TECHNIQUE / Postoperative Complication / Boolean Satisfiability / Gastric Bypass / Abdominal Surgery / Laparoscopy / Prospective Study / Minimal Invasive Surgery / Female / Male / Young Adult / Gastric banding / Obesity Surgery / Clinical Sciences / Middle Aged / Adult / Public health systems and services research / SURGICAL TECHNIQUE / Postoperative Complication / Boolean Satisfiability / Gastric Bypass / Abdominal Surgery / Laparoscopy / Prospective Study / Minimal Invasive Surgery