1. Department of Health, Nyandarua County, Kenya
2. Department of Biostatistics, School of Public Health, Fudan University, Shanghai, China
3. School of Medical Sciences, Örebro University, Örebro, Sweden
4. Department of Orthopaedic Surgery, Nanjing Drum Tower Hospital, the Affiliated Hospital of Nanjing University Medical School, Nanjing, Jiangsu, China
5. IM Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
6. Research Department, Innlandet Hospital Trust, Brumunddal, Norway
7. Department of Nutrition Hygiene, Division of Health Risk Factor Monitoring and Control, Shanghai Municipal Center for Disease Control and Prevention, Shanghai, China
8. Clinical Epidemiology and Biostatistics, School of Medical Sciences, Örebro University, Örebro, Sweden