Vagotomy, Proximal GastricVagotomyVagotomy, TruncalDuodenal UlcerGastroenterostomyPylorusPostgastrectomy SyndromesPyloric AntrumGastric JuicePyloric StenosisPentagastrinStomachPeptic Ulcer PerforationGastric EmptyingGastric AcidDrainageGastrinsVagus NerveDumping SyndromeRecurrencePeptic UlcerPostoperative ComplicationsFollow-Up StudiesGastrectomyGastrointestinal MotilityStomach UlcerDuodenum