About the Authors
Department of Public Health and Primary Care, Institute of Public Health, University of Cambridge School of Clinical Medicine, Cambridge, United Kingdom
Medical Research Council, Epidemiology Unit, Cambridge, United Kingdom
Medical Research Council, Dunn Nutrition Unit, Cambridge, United Kingdom
The authors have declared that no competing interests exist.
KTK, NW, SB, and ND are principal investigators in the EPIC-Norfolk population study. NW developed and validated the physical activity measures and scales. AW was responsible for nutritional data involved in the physical activity validation and calibration studies. RL is responsible for data management, record linkage, and computing overall. KTK conducted the data analyses, wrote the paper with coauthors, had full access to all of the data in the study, and takes responsibility for the integrity of the data and the accuracy of the data analysis.