About the Authors

Peter Binyaruka

Affiliation Ifakara Health Institute, Plot 463, Dar es Salaam, Tanzania

Edith Patouillard

Affiliation London School of Hygiene& Tropical Medicine, London, United Kingdom

Timothy Powell-Jackson

Affiliation London School of Hygiene& Tropical Medicine, London, United Kingdom

Giulia Greco

Affiliation London School of Hygiene& Tropical Medicine, London, United Kingdom

Ottar Maestad

Affiliation Chr. Michelsens Institutt, Jekteviksbakken 31, Bergen, Norway

Josephine Borghi

jo.borghi@lshtm.ac.uk

Affiliation London School of Hygiene& Tropical Medicine, London, United Kingdom

Competing Interests

The authors of this manuscript have the following competing interests: all authors were funded by the Government of Norway to undertake this research. The Government of Norway also funded the P4P programme in Pwani region of Tanzania. The funder of the study had no role in data analysis, data interpretation, or writing of the manuscript. All authors have completed the ICMJE uniform disclosure form at www.icmje.org/coi_disclosure.pdf (available on request from the corresponding author). This does not alter the authors' adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: JB OM. Analyzed the data: PB EP TPJ GG OM JB. Contributed reagents/materials/analysis tools: PB EP JB. Wrote the paper: JB TPJ PB. Contributed to data interpretation: PB EP TPJ GG OM JB. Critically revised the manuscript: EP GG OM.