Bariatric SurgeryObesity, MorbidLaparoscopyGeneral SurgeryGastric BypassGastroplastyWeight LossBiliopancreatic DiversionCholecystectomy, LaparoscopicPostoperative ComplicationsTreatment OutcomeLysogenyJejunoileal BypassBariatric MedicineHyperoxaluriaAnastomosis, Roux-en-YSurgical Procedures, OperativeSurgery Department, HospitalAvitaminosisPreoperative PeriodSpecialties, SurgicalBody Mass IndexPostoperative PeriodPostoperative CareRetrospective StudiesProspective StudiesGastrectomyPreoperative CareFollow-Up StudiesBariatricsInternship and ResidencyInformed Consent By MinorsLength of StayEducation, Medical, GraduateGastric FistulaTime FactorsIntraoperative ComplicationsErythemaAppendectomyTooth WearDiabetes Mellitus, Type 2Operative TimeSurgical Procedures, ElectiveMalabsorption SyndromesReoperationPerioperative PeriodRisk FactorsMyo-Inositol-1-Phosphate Synthase