1. Unit of Health Sciences, Faculty of Social Sciences Tampere University Tampere Finland
2. Department of Quality Management Ningxia Center for Disease Control and Prevention Yinchuan China
3. Unit of Welfare and Health Promotion Finnish Institute for Health and Welfare Helsinki Finland
4. Research Center for Child Health Tampere University and University Hospital Tampere Finland
5. Science Center Pirkanmaa Hospital District Tampere Finland
6. The Social Insurance Institution of Finland (Kela) Helsinki Finland