[Gastritis and peptic ulcers in the Batak people at North Sumatra].
D005756:Gastritis / Q000453:epidemiology*; D006801:Humans; D007214:Indonesia; D010437:Peptic Ulcer / Q000706:statistics & numerical data*
GASTRITIS/epidemiology; PEPTIC ULCER/statistics
Gastritis und Magengeschwüre bei den Batak in Nordsumatra.