1. World Health Organization. Global immunization vision and strategy 2014. Geneva: WHO; Available at: http://whqlibdoc.who.int/hq/2005/WHO_IVB_05.05.pdf?ua=1 (accessed March 4, 2015).
2. World Health Organization. Global immunization data, February 2014. Geneva: WHO; Available at: http://www.who.int/immunization/monitoring_surveillance/Global_Immunization_Data.pdf?ua=1 (accessed March 4, 2015).
3. Comparative effectiveness of acellular versus whole-cell pertussis vaccines in teenagers;Klein;Pediatrics,2013
4. Expanded programme on immunization;Keja;World Health Stat Q,1988
5. World Health Organization. WHO global immunization data 2014. Geneva: WHO; Available at: http://www.who.int/immunization/monitoring_surveillance/global_immunization_data.pdf (accessed March 4, 2015).