[The lower esophageal sphincter, an unfamiliar site].
D003937:Diagnosis, Differential; D004943:Esophagogastric Junction / Q000033:anatomy & histology* / Q000502:physiology; D006548:Hernia, Diaphragmatic / Q000175:diagnosis; D006801:Humans
El esfínter esofágico inferior; ese desconocido.