1. Department of Occupational and Public Health Sciences, University of Gävle, Kungsbäcksvägen 47, Gävle 801 76, Sweden
2. EPIUnit – Instituto de Saúde Pública, Universidade do Porto, Rua das Taipas 135, Porto 4050-600, Portugal
3. Department of Education, Stockholm University, Frescativägen, 11419, Stockholm 106 91, Sweden
4. Department of LIME, Karolinska Institutet, Solnavägen 1, Solna 171 77, Sweden
5. Department of Health Services Management, Faculty of Health Sciences, University of Malta, Msida MS2080, Malta
6. Health Services Management Centre, School of Social Policy, College of Social Sciences, University of Birmingham, Birmingham B15 2TT, UK