Vaccine
Volume 36, Issue 29  Pages 4153-4392 (5 July 2018)
https://www.sciencedirect.com/journal/vaccine/vol/36/issue/28

Childhood vaccines in Uganda and Zambia: Determinants and barriers to vaccine coverage
Open access – Original research article
Pages 4236-4244
David E. Phillips, Joseph L. Dieleman, Jessica C. Shearer, Stephen S. Lim