[1] Erasmus MC, Dept Cardiol, Rotterdam, Netherlands
[2] Turku PET Ctr, Turku, Finland
[3] Vrije Univ Amsterdam Med Ctr, Dept Physiol, Amsterdam, Netherlands
[4] RUB, Dept Cardiovasc Physiol, Fac Med, Bochum, Germany
[5] Univ Med Ctr Utrecht, Dept Hypertens & Nephrol, Utrecht, Netherlands