1. Department of Radiation Therapy, Vaasa Central Hospital, Hietalahdenkatu 2-4, 65100 Vaasa, Finland
2. HERMES Medical Solutions, Skeppsbron 44, 11130 Stockholm, Sweden
3. Department of Clinical Physiology and Nuclear Medicine, Kuopio University Hospital, P.O. Box 1777, 70211 Kuopio, Finland
4. Niuvanniemi Hospital, 70211 Kuopio, Finland