GastroplastyStomachObesity, MorbidJejunoileal BypassGastric BypassAnastomosis, Roux-en-YPirinitramideSurgical StaplersHernia, HiatalWeight LossEsophageal StenosisEsophagusFundoplicationStomach NeoplasmsBariatric SurgeryLaparoscopyPostoperative ComplicationsGastroesophageal RefluxPostoperative PeriodStomach DiseasesReoperationMethodsObesityFollow-Up StudiesGastric MucosaStomach Ulcer