About the Authors

Christiane Horwood

horwoodc@ukzn.ac.za

Affiliation Centre for Rural Health, University of KwaZulu-Natal, Durban, KwaZulu Natal, South Africa

Lisa M. Butler

Affiliation University of California, San Francisco, Department of Epidemiology and Biostatistics and Global Health Sciences, San Francisco, California, United States of America

Lyn Haskins

Affiliation Centre for Rural Health, University of KwaZulu-Natal, Durban, KwaZulu Natal, South Africa

Sifiso Phakathi

Affiliation Centre for Rural Health, University of KwaZulu-Natal, Durban, KwaZulu Natal, South Africa

Nigel Rollins

Affiliations Department of Maternal, Newborn, Child and Adolescent Health, World Health Organization, Geneva, Switzerland, Department of Paediatrics and Child Health, University of KwaZulu-Natal, Durban, KwaZulu Natal, South Africa

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: NR CH. Performed the experiments: CH LH SP NR. Analyzed the data: LB CH LH SP. Wrote the paper: CH LB LH SP NR.