1. University of Oslo, Oslo, Norway
2. Telemark Hospital, Skien, Norway
3. Rigshospitalet, Copenhagen, Denmark
4. Sørlandet Hospital, Kristiansand, Norway
5. Vestre Viken Bærum Hospital, Gjettum, Norway
6. Vestfold Hospital, Tønsberg, Norway
7. Beth Israel Deaconess Medical Center, Boston, MA
8. Karolinska Institutet, Stockholm, Sweden
9. Lovisenberg Diaconal Hospital, Oslo, Norway
10. Oslo University Hospital, Oslo, Norway