1. World Health Organization. Immunization Coverage, http://www.who.int/mediacentre/factsheets/fs378/en/, 2017 [accessed November 2017].
2. WHO EMRO. Pakistan, Expanded Program on Immunization, http://www.emro.who.int/pak/programmes/expanded-programme-on-immunization.html/; 2017 [accessed November 2017].
3. National nutrition survey Pakistan;Bhutta,2011
4. World Health Organization. Global Vaccine Action Plan 2011–2020 [Internet] Available from: http://www.who.int/immunization/global_vaccine_action_plan/GVAP_doc_2011_2020/en/ [accessed 02.02.17].
5. WHO. WHO vaccine-preventable diseases: monitoring system. 2016 global summary. WHO UNICEF estimates time series for Pakistan (PAK); 2016.