[1] Glostrup Univ Hosp, Dept Clin Physiol & Nucl Med, DK-2600 Glostrup, Denmark
[2] Cornell Univ, Weill Med Coll, New York, NY 10021 USA
[3] Skelleftea Lasarett, Skelleftea, Sweden
[4] Haukeland Hosp, N-5021 Bergen, Norway
[5] Vet Affairs Med Ctr, Washington, DC 20422 USA
[6] Univ Helsinki Hosp, Helsinki, Finland
[7] Sahlgrenska Univ Hosp Ostra Goteborg, Gothenburg, Sweden