About the Authors

Nancy A. Scott

Roles Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Visualization, Writing – original draft, Writing – review & editing

nscott@bu.edu

Affiliation Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, United States of America

Taryn Vian

Roles Conceptualization, Formal analysis, Funding acquisition, Investigation, Methodology, Writing – original draft, Writing – review & editing

Affiliation Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, United States of America

Jeanette L. Kaiser

Roles Data curation, Formal analysis, Project administration, Visualization, Writing – review & editing

Affiliation Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, United States of America

Thandiwe Ngoma

Roles Data curation, Project administration, Writing – review & editing

Affiliation Zambia Center for Applied Health Research and Development (ZCAHRD), Lusaka, Zambia

Kaluba Mataka

Roles Project administration, Writing – review & editing

Affiliation Zambia Center for Applied Health Research and Development (ZCAHRD), Lusaka, Zambia

Elizabeth G. Henry

Roles Conceptualization, Writing – original draft, Writing – review & editing

Affiliation Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, United States of America

Godfrey Biemba

Roles Project administration, Writing – review & editing

Affiliations Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, United States of America, Zambia Center for Applied Health Research and Development (ZCAHRD), Lusaka, Zambia

Mary Nambao

Roles Writing – review & editing

Affiliation Department of Public Health, Ministry of Health, Lusaka, Zambia

Davidson H. Hamer

Roles Conceptualization, Funding acquisition, Methodology, Writing – original draft, Writing – review & editing

Affiliations Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, United States of America, Department of Medicine, Boston Medical Center, Boston, Massachusetts, United States of America

Competing Interests

We received funding from a commercial source, 'Merck' through its corporate responsibility Merck for Mothers program. This does not alter our adherence to PLOS ONE policies on sharing data and materials.