1 Cooperative Research Group for Evidence-Based Public Health (ebph), Institute for Public Health and Nursing Research, University of Bremen and Leibniz Institute for Prevention Research and Epidemiology-BIPS, Achterstraße 30, 28359 Bremen, Germany; Health Sciences Bremen, University of Bremen, Bibliothekstraße 1, 28359 Bremen, Germany; Institute of Health Service Research and Health Economics, Faculty of Medicine, Heinrich-Heine University Düsseldorf, 40225 Düsseldorf, Germany.
2 Department of Hygiene and Dietetics, Jagiellonian University Medical College, 31-034 Krakow, Poland.
3 Department of Preventive Medicine, Lithuanian University of Health Sciences, LT-49264 Kaunas, Lithuania.