[Seasonal cycles in gastroduodenal ulcer in two different categories of workers].
D001699:Biometry; D010437:Peptic Ulcer / Q000453:epidemiology* / Q000706:statistics & numerical data*; D012621:Seasons
PEPTIC ULCER/epidemiology and statistics
Cicli staglonali dell'ulcera gastro-duodenale in due differenti categorie di lavoratori.