1. Department of Radiation Physics, Sahlgrenska Academy at Göteborg University, Sahlgrenska University Hospital, Göteborg, Sweden.
2. Department of Oncology, The Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden.
3. PET and Cyclotron Unit, KF3982, Copenhagen University Hospital, Copenhagen, Denmark.
4. Division of Energy and Materials, Department of Biological and Chemical Engineering, Chalmers University of Technology, Göteborg, Sweden.