From the aDepartment of Clinical Epidemiology, Leiden University Medical Center, Leiden, The Netherlands
bDepartment of Clinical Epidemiology, Aarhus University Denmark
cDepartment of Medical Statistics, Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, United Kingdom
dDepartment of Medical Statistics, London School of Hygiene and Tropical Medicine, United Kingdom.
This work was supported by the European Research Council under the European Union’s Seventh Framework Programme [FP7/2007–2013 / ERC grant agreement number 668954]. The Centre for Global NCDs is supported by the Wellcome Trust Institutional Strategic Support Fund (097834/Z/11/B).
The authors report no conflicts of interest.
Supplemental digital content is available through direct URL citations in the HTML and PDF versions of this article (www.epidem.com).
Correspondence: Jan P. Vandenbroucke, Department of Clinical Epidemiology, Leiden University Medical Center, PO Box 9600, 2300 RC Leiden, The Netherlands. E-mail: [email protected].