aDepartment of Community Health Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Kingdom of Saudi Arabia
bMRC-PHE Centre for Environment and Health, Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, Norfolk Place, London, UK
cDepartment of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Evanston, Chicago, Illinois, USA
Correspondence to Dr Linda M. Oude Griep, PhD, Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, St Mary's Campus, Norfolk Place, London W2 1PG, UK. Tel: +44 207 594 3300; e mail: [email protected]
Received 19 December, 2017
Revised 26 March, 2018
Accepted 8 April, 2018
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