Bariatric SurgeryObesity, MorbidGastric BypassGastroplastyWeight LossBedsBariatric MedicineBiliopancreatic DiversionBed RestObesityJejunoileal BypassAnastomosis, Roux-en-YBariatricsAvitaminosisPreoperative PeriodHyperoxaluriaLaparoscopyBody Mass IndexBed OccupancyGastrectomyPostoperative ComplicationsTreatment OutcomeTooth WearGastric FistulaPostoperative PeriodInformed Consent By MinorsDiabetes Mellitus, Type 2Malabsorption SyndromesGastric BalloonPostoperative CareAnti-Obesity AgentsGlucagon-Like Peptide 1Gastrointestinal HormonesProspective StudiesPeptide YYHospital Bed CapacityPatient SelectionPreoperative CareComorbidityPerioperative PeriodFollow-Up Studies