title: Observer bias in acellular pertussis vaccine trials.
authors.forename: C H
authors.initials: CH
authors.lastname: Wirsing von König
authors.forename: H J
authors.initials: HJ
authors.lastname: Schmitt
authors.forename: A
authors.initials: A
authors.lastname: Neiss
mesh_terms: D002648:Child; D002986:Clinical Trials as Topic; D006801:Humans; D015588:Observer Variation; D010567:Pertussis Vaccine; D011446:Prospective Studies; D012107:Research Design; D014917:Whooping Cough / Q000453:epidemiology / Q000517:prevention & control*
chemical_list: D010567:Pertussis Vaccine