1. Department of Health Policy, School of Public Health, Mongolian National University of Medical Sciences , Ulaanbaatar , Mongolia
2. Department of Epidemiology, University Medical Center Groningen, University of Groningen , Groningen , The Netherlands
3. Faculty of Science and Engineering, Groningen Research Institute of Pharmacy, University of Groningen , Groningen , The Netherlands
4. Faculty of Science and Engineering, Centre for Nutrition, Prevention, and Health Services, Institute for Public Health and the Environment , Bilthoven , The Netherlands