1 Institute of Medical Sociology, Medical Faculty, University of Düsseldorf, Düsseldorf, Germany Clinicum, Faculty of Medicine, University of Helsinki, Helsinki, Finland, Department of Epidemiology and Public Health, University College London, London, United Kingdom, Finnish Institute of Occupational Health, Helsinki, Tampere and Turku, Finland Institute of Medical Sociology, Centre for Health and Society, Medical Faculty, University of Düsseldorf, Düsseldorf, Germany, dragano@med.uni-duesseldorf.de.