1. Faculty of Medicine, Landspitali University Hospital, University of Iceland, Reykjavik, Iceland;
2. Orebro University Hospital, Orebro, Sweden;
3. Karolinska University Hospital, Stockholm, Sweden;
4. Aarhus University Hospital, Skejby, Denmark;
5. Turku University Hospital, Turku, Finland;
6. Sahlgrenska University Hospital, Gothenburg, Sweden;
7. Tampere University Hospital, Tampere, Finland;
8. Skane University Hospital, Lund, Sweden