S S Koenders1,2, J A van Dalen3, J D van Dijk4. 1. Department of Nuclear Medicine, Isala Hospital, PO Box 10400, 8000 GK, Zwolle, The Netherlands. 2. Technical Medical Center, University of Twente, Enschede, The Netherlands. 3. Department of Medical Physics, Isala Hospital, Zwolle, The Netherlands. 4. Department of Nuclear Medicine, Isala Hospital, PO Box 10400, 8000 GK, Zwolle, The Netherlands. jorisvdijk@gmail.com.