[Liver diseases and gallbladder diseases in merchant seamen].
D001699:Biometry; D005705:Gallbladder Diseases; D006801:Humans; D008107:Liver Diseases / Q000706:statistics & numerical data*; D009787:Occupational Medicine / Q000706:statistics & numerical data*
GALLBLADDER/diseases; INDUSTRIAL MEDICINE/statistics; LIVER DISEASES/statistics