About the Authors

Thomas E. Guadamuz

tguadamu@hotmail.com

Affiliations Department of Society and Health, Faculty of Social Sciences and Humanities, Mahidol University, Nakhon Pathom, Thailand, Center for Health Policy Studies, Faculty of Social Sciences and Humanities, Mahidol University, Nakhon Pathom, Thailand

Doug H. Cheung

Affiliations Center for Health Policy Studies, Faculty of Social Sciences and Humanities, Mahidol University, Nakhon Pathom, Thailand, Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts, United States of America

Chongyi Wei

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

Stuart Koe

Affiliation ICM Pharma Pte Ltd, Singapore

Sin How Lim

Affiliation Center of Excellence for Research in AIDS, University of Malaya, Kuala Lumpur, Malaysia

Competing Interests

Stuart Koe is currently with ICM Pharma Pte Ltd, Singapore. However, he did not receive funding or compensation from his current employer to fund this present study or the development of this manuscript. This does not alter the authors' adherence to PLOS ONE policies on sharing data and materials. All authors have no other relevant declarations relating to employment, consultancy, patents, products in development, marketed products, etc.

Author Contributions

Conceived and designed the experiments: TG DC CW SK SL. Performed the experiments: TG DC CW SK SL. Analyzed the data: TG DC CW SL. Contributed reagents/materials/analysis tools: SK. Wrote the paper: TG DC CW SL.