GastroplastyObesity, MorbidGastric BypassAnastomosis, Roux-en-YWeight LossBariatric SurgeryObesityJejunoileal BypassBiliopancreatic DiversionLaparoscopySurgical StaplersStomachPostoperative ComplicationsPirinitramideBody Mass IndexAvitaminosisJejunumPostoperative PeriodHernia, HiatalFollow-Up StudiesBody WeightGastrectomyReoperationTreatment OutcomeEsophageal StenosisMethodsFundoplicationEsophagusGlucagon-Like Peptide 1Malabsorption SyndromesPostoperative CareDiabetes Mellitus, Type 2Prospective StudiesTime FactorsPeptide YYElephantiasisJejunostomyIleumBlood GlucoseLeptinSteatorrheaInsulin ResistanceGastric FistulaVitamin B DeficiencyComorbidityEatingRetrospective StudiesRisk FactorsHyperoxaluriaPrader-Willi SyndromeObesity, AbdominalIncretinsGastroesophageal RefluxLength of StayInsulinPediatric ObesityAdipose TissueGastrostomyFood PreferencesAppetite RegulationVertical DimensionGastric Inhibitory PolypeptideFatty LiverReceptors, Leptin