About the Authors

Rajnish Joshi

Affiliations Division of Epidemiology, School of Public Health, University of California Berkeley, Berkeley, California, United States of America , Department of Medicine, Mahatma Gandhi Institute of Medical Sciences, Sevagram, Maharashtra, India

Arthur L Reingold

Affiliation Division of Epidemiology, School of Public Health, University of California Berkeley, Berkeley, California, United States of America

Dick Menzies

Affiliation Montreal Chest Institute, McGill University, Montreal, Canada

Madhukar Pai

To whom correspondence should be addressed. E-mail: madhukar.pai@mcgill.ca

Affiliation Montreal Chest Institute, McGill University, Montreal, Canada

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

RJ, AR, DM, and MP conceived and designed the study. RJ and MP collected, analyzed, and interpreted the data. RJ and MP drafted the manuscript. RJ, AR, DM, and MP performed critical revision of the manuscript.