1. Department for Plastic and Hand Surgery, Inselspital University Hospital Bern, University of Bern, 3012 Bern, Switzerland
2. Department of Sociology, Institute of Sociological Research, University of Geneva, 1211 Geneva, Switzerland
3. Division of Social and Behavioural Sciences, School of Public Health, University of Cape Town, Cape Town 7925, South Africa
4. Department of Orthopaedic and Trauma Surgery, Lucerne Cantonal Hospital, 6002 Lucerne, Switzerland
5. AO Research Institute Davos, 7270 Davos, Switzerland