Letter: Hepatitis.
D003726:Dental Assistants; D003813:Dentistry; D005260:Female; D006509:Hepatitis B / Q000517:prevention & control*; D006511:Hepatitis B Antigens / Q000302:isolation & purification; D006801:Humans; D008297:Male; D009784:Occupational Diseases / Q000517:prevention & control*
D006511:Hepatitis B Antigens