About the Authors

Mia L. van der Kop

miavanderkop@gmail.com

Affiliations University of British Columbia, Vancouver, British Columbia, Canada, British Columbia Centre for Disease Control, Vancouver, British Columbia, Canada

Sarah Karanja

Affiliation University of Manitoba, Nairobi, Kenya

Lehana Thabane

Affiliation McMaster University, Hamilton, Ontario, Canada

Carlo Marra

Affiliation University of British Columbia, Vancouver, British Columbia, Canada

Michael H. Chung

Affiliation University of Washington, Seattle, Washington, United States of America

Lawrence Gelmon

Affiliations University of Manitoba, Nairobi, Kenya, University of Nairobi, Nairobi, Kenya

Joshua Kimani

Affiliation University of Nairobi, Nairobi, Kenya

Richard T. Lester

Affiliations University of British Columbia, Vancouver, British Columbia, Canada, British Columbia Centre for Disease Control, Vancouver, British Columbia, Canada, University of Manitoba, Nairobi, Kenya, University of Nairobi, Nairobi, Kenya

Competing Interests

Richard T. Lester is the founder of WelTel, a non-profit non-governmental mHealth organization. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: RL CM MvdK LT LG. Analyzed the data: MvdK. Wrote the paper: MvdK. Performed the data collection: SK. Supervised the data collection: RTL. Data interpretation: MvdK RTL CM JK MC. Revised the manuscript critically for intellectual content: RTL CM LT MC SK JK and LG. Approved the final manuscript submitted for publication: MvdK SK LT CM MC LG JK RL.