1. Örebro University, Örebro; Capio St Göran Hospital, S-112 81 Stockholm, Sweden. Tel: + 46 8 587 020 60; Fax: + 46 8 587 019 30;
2. The Sahlgrenska Academy at Göteborg University, Institute of Health and Care Sciences, Göteborg, Sweden
3. Örebro University, Örebro, Sweden