About the Authors
Department of Public Health and Primary Care, Institute of Public Health, University of Cambridge, United Kingdom
Icelandic Heart Association, Kopavegur, Iceland
The authors have declared that no competing interests exist. JD is a member of the editorial board of PLOS Medicine.
JGW, KDMJ, GE, VG, and JD designed the study. JGW, KDMJ, GE, VG, and JD analyzed the data. JGW conducted statistical analyses. JGW, KDMJ, GE, VG, and JD contributed to writing the paper.