[Letter: Problems of function analysis of the lower esophageal sphincter].
D004943:Esophagogastric Junction / Q000502:physiology; D004947:Esophagus / Q000502:physiology*; D006801:Humans; D008365:Manometry; D008433:Mathematics
Zur Problematik der Funktionsanalyse des unteren Osophagussphinkters