The use of placebo controls.
Cagliano
S
S
Traversa
G
G
D004992:Ethics, Medical; D006801:Humans; D007223:Infant; D007558:Italy; D010567:Pertussis Vaccine; D010919:Placebos; D018074:Vaccines, Conjugate; D014917:Whooping Cough / Q000517:prevention & control*
D010567:Pertussis Vaccine; D010919:Placebos; D018074:Vaccines, Conjugate