About the Authors
Clinical Trials Research Unit, School of Population Health, University of Auckland, New Zealand
Harvard School of Public Health, Boston, Massachusetts, United States of America
School of Population Health, University of Queensland, Brisbane, Australia
The authors have declared that no competing interests exist. ADL is a member of the editorial board of PLoS Medicine.
AR, ME, ADL and CJLM designed the study. SVH and RBL analyzed the data. AR, ME, SVH, and ADL contributed to writing the paper.