title: The risk of vaccination--the importance of "negative" studies.
authors.forename: B G
authors.initials: BG
authors.lastname: Gellin
authors.forename: W
authors.initials: W
authors.lastname: Schaffner
mesh_terms: D036262:Empirical Research; D006266:Health Education; D017325:Hepatitis B Vaccines / Q000009:adverse effects*; D006801:Humans; D009103:Multiple Sclerosis / Q000209:etiology* / Q000276:immunology; D012008:Recurrence; D012306:Risk; D014611:Vaccination / Q000009:adverse effects*; D014612:Vaccines / Q000009:adverse effects / Q000276:immunology
chemical_list: D017325:Hepatitis B Vaccines; D014612:Vaccines