GastrectomyObesity, MorbidLaparoscopyBariatric SurgeryGastroplastyWeight LossGastric BypassTreatment OutcomeBody Mass IndexCholecystectomy, LaparoscopicFollow-Up StudiesProspective StudiesPostoperative ComplicationsStomach NeoplasmsStomachAnastomosis, Roux-en-YGastrointestinal HormonesPostgastrectomy SyndromesGastroenterostomyGhrelinRats, Long-EvansGlucagon-Like Peptide 1ObesityLaparoscopesGastric StumpBody WeightBlood GlucosePneumoperitoneum, ArtificialRoboticsAppendectomyFundoplicationRetrospective StudiesAnastomosis, Surgical