title: Letter: Frequency of hepatitis in dentists in Ontario.
mesh_terms: D003815:Dentists; D006505:Hepatitis / Q000453:epidemiology* / Q000276:immunology; D006511:Hepatitis B Antigens; D006801:Humans; D009784:Occupational Diseases / Q000453:epidemiology* / Q000276:immunology; D009864:Ontario; D012463:Saliva / Q000382:microbiology
chemical_list: D006511:Hepatitis B Antigens