C. Vizzotti,M. V. Juarez,E. Bergel,V. Romanin,G. Califano,S. Sagradini,C. Rancaño,A. Aquino,R. Libster,F. P. Polack and J. Manzur. Impact of a maternal immunization program against pertussis in a developing country. Vaccine. 2016;34(50):10.1016/j.vaccine.2016.10.081.