1. 1Turku PET Centre, University of Turku, Turku, Finland
2. 2Turku University Hospital, University of Turku, Turku, Finland
3. 3Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
4. 4Department of Nuclear Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Republic of Korea
5. 5Department of Training and Education Sciences, Faculty of Social Sciences, University of Antwerp, Antwerp, Belgium
6. 6Department of Psychology, University of Turku, Turku, Finland