Randomized Controlled Trial
Sustained efficacy during the first 6 years of life of 3-component acellular pertussis vaccines administered in infancy: the Italian experience.
Pediatrics. 2001 Nov 1;108(5):E81.
Practice Guideline
Updated recommendations for use of tetanus toxoid, reduced diphtheria toxoid and acellular pertussis (Tdap) vaccine from the Advisory Committee on Immunization Practices, 2010.
MMWR Morb. Mortal. Wkly. Rep. 2011 Jan 14;60(1):13-5.