1. Department of Medicine, Division of Cardiology; Landspitalinn v. Hringbraut; 101 Reykjavik Iceland
2. Division of Internal Medicine; Karolinska Institutet Danderyd Hospital; Danderyd Sweden
3. Institute for Surgical Research, University of Oslo; Rikshospitalet Oslo Norway
4. Department of Medicine; Sahlgrenska University Hospital/Östra; Göteborg Sweden