[Clinical and serological observations on the relation existing between streptococcal infections and gastroduodenal ulcer].
D006801:Humans; D010437:Peptic Ulcer / Q000209:etiology*; D013290:Streptococcal Infections / Q000150:complications*; D013291:Streptococcus
PEPTIC ULCER/etiology; STREPTOCOCCAL INFECTIONS/complications