1 Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge , Cambridge , UK.
2 MRC Epidemiology Unit, Institute of Metabolic Science, Cambridge Biomedical Campus, University of Cambridge School of Clinical Medicine , Cambridge , UK ; Department of Epidemiology, University Medical Center Groningen, University of Groningen , Groningen , Netherlands ; Department of Internal Medicine, University Medical Center Groningen, University of Groningen , Groningen , Netherlands.
3 Sport, Health and Nutrition Department, Leeds Trinity University , Leeds , UK.