1. Systematic review of missed opportunities for vaccination;WHO,2013
2. Studies of missed opportunities for immunization in developing and industrialized countries;Hutchins;Bull World Health Organ,1993
3. Missed opportunities for immunizations: a review of the evidence;Szilagyi;J Public Health Manag Pract,1996
4. Vaccination coverage and reasons for non-vaccination in a district of Istanbul;Torun;BMC Public Health,2006
5. Immunization status of children admitted to a tertiary-care hospital of North India: reasons for partial immunization or non-immunization;Kumar;J Health Popul Nutr,2010