1. Mathias Onsrud, Taran P. Hellebust, Claes G. Tropé, and Gunnar B. Kristensen, Norwegian Radium Hospital, Oslo University Hospital; Mathias Onsrud, Milada Cvancarova, Taran P. Hellebust, and Claes G. Tropé, University of Oslo, Oslo; Taran P. Hellebust, Norwegian Radiation Protection Authority, Østerås; and Kristina Lindemann, Akershus University Hospital, Lørenskog, Norway.