1. Department of Physiology, Medical and Health Science Centre, Medical School, University of Debrecen, PO Box 22, H‐4012, Hungary
2. Laboratory for Physiology, Institute for Cardiovascular Research, van der Boechorststraat 7, 1081 BT Amsterdam, The Netherlands
3. Institute for Research in Extramural Medicine, Vrije Universiteit Amsterdam, van der Boechorststraat 7, 1081 BT Amsterdam, The Netherlands