Laparoscopic Revision of Jejunoileal Bypass to Gastric Bypass

This study objectives are the following. * To describe the updated clinical presentation, indications, and multidisciplinary medical management of patients with a failed and/or complicated jejunoileal bypass (JIB). * To analyze the feasibility, safety, and efficacy of one-stage laparoscopic re-operative gastric bypass surgery for failed and/or complicated Jejunoileal bypass (JIB) for weight loss. * To determine what factors or strategies are associated with a successful outcome. In particular, the completion of the surgery in one stage with a laparoscopic approach.