Venereal disease among seafarers on board of Polish ships.
D002602:Chancroid / Q000453:epidemiology; D006801:Humans; D008297:Male; D009326:Naval Medicine; D011044:Poland; D012749:Sexually Transmitted Diseases / Q000453:epidemiology*; D012767:Ships; D013587:Syphilis / Q000453:epidemiology; D014526:Urethritis / Q000453:epidemiology