1 Cardiovascular Regenerative Medicine Research Group of the Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Hanzeplein 1 - EA11, 9713 GZ, Groningen, The Netherlands.
2 Cardiovascular Regenerative Medicine Research Group of the Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Hanzeplein 1 - EA11, 9713 GZ, Groningen, The Netherlands. m.c.harmsen@umcg.nl.