1. Epidemiology, Biostatistics and Prevention Institute, Department of Epidemiology, University of Zurich, Zurich, Switzerland
2. Department of Epidemiology & Biostatistics, University of California San Francisco, San Francisco, CA, USA
3. School of Public Health and Preventive Medicine, Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, VIC, Australia
4. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA