Letter: Hepatitis surveillance in an oncology unit.
D000293:Adolescent; D003428:Cross Infection / Q000453:epidemiology / Q000517:prevention & control*; D006509:Hepatitis B / Q000453:epidemiology / Q000517:prevention & control*; D006757:Hospital Units; D006801:Humans; D009369:Neoplasms / Q000628:therapy*; D010564:Personnel, Hospital