GastroplastyObesity, MorbidObesityJejunoileal BypassGastric BypassAnastomosis, Roux-en-YPirinitramideSurgical StaplersStomachWeight LossHernia, HiatalObesity, AbdominalEsophageal StenosisBariatric SurgeryPediatric ObesityBody Mass IndexFundoplicationEsophagusBody WeightLaparoscopyPostoperative ComplicationsOverweightGastroesophageal RefluxPostoperative PeriodReoperationAdipose TissueFollow-Up StudiesMethodsLeptinRisk FactorsInsulin ResistancePrevalenceAnti-Obesity AgentsAdiposityDiet