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.
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Morbidity and mortality
Timeframe: throughout follow-up
Weight loss expressed as Body Mass Index and Percentage excess weight loss
Timeframe: throughout follow-up
Remission or improvement of symptoms and JIB-related complications
Timeframe: throughout follow-up
Remission or improvement of other comorbidities
Timeframe: throughout follow-up