Frequency of peptic ulcer among executives, craftsmen, and foreman.
J P
JP
DUNN
S
S
COBB
D006801:Humans; D009784:Occupational Diseases / Q000706:statistics & numerical data*; D010437:Peptic Ulcer / Q000706:statistics & numerical data*
OCCUPATIONAL DISEASES/statistics; PEPTIC ULCER/statistics