title: Combination vaccines: issues in evaluation of effectiveness and safety.
authors.affiliation: Epidemiology Department, Merck Research Laboratories, Blue Bell, PA, USA.
authors.forename: H A
authors.initials: HA
authors.lastname: Guess
mesh_terms: D017277:Drug Approval; D015340:Epidemiologic Research Design; D006801:Humans; D012449:Safety; D014481:United States; D014486:United States Food and Drug Administration; D017778:Vaccines, Combined
chemical_list: D017778:Vaccines, Combined