1. Departments of Epidemiology, Maastricht University CAPHRI School for Public Health and Primary Care, Maastricht, The Netherlands
2. Department of Human Biology, Maastricht University Medical Centre, Maastricht, The Netherlands
3. Departments of Methodology and Statistics, Maastricht University CAPHRI School for Public Health and Primary Care, Maastricht, The Netherlands
4. Institute of Epidemiology I, Helmholtz Zentrum München German Research Center for Environmental Health, Neuherberg, Germany