Antti Saraste1,2, Jeroen J Bax3,4. 1. Turku PET Centre, Turku University Hospital and University of Turku, Turku, Finland. 2. Heart Center, Turku University Hospital and University of Turku, Turku, Finland. 3. Heart Center, Turku University Hospital and University of Turku, Turku, Finland. j.j.bax@lumc.nl. 4. Department of Cardiology, Heart Lung Centre, Leiden University Medical Centre, Albinusdreef 2, 2300 RC, Leiden, The Netherlands. j.j.bax@lumc.nl.