An open letter to Professor Dr. Bernardino Ramazzini.
D004503:Education, Medical, Graduate; D004504:Education, Medical, Undergraduate; D004781:Environmental Exposure; D004812:Epidemiologic Methods; D049673:History, 20th Century; D006801:Humans; D008511:Medicine; D009784:Occupational Diseases / Q000209:etiology; D009787:Occupational Medicine / Q000193:education / Q000266:history / Q000592:standards; D013038:Specialization; D014481:United States