1. Sarcoma Patient Organization, Ovre Vollgt. 11, Oslo 0158, Norway
2. Department of Oncology, Norwegian Radium Hospital, Oslo University Hospital, P.O. Box 4953 Nydalen, Oslo 0424, Norway
3. Department of Interdisciplinary Health Sciences, Institute of Health and Society, University of Oslo, Postboks 1089 Blindern, Oslo 0317, Norway