1 Cardiovascular Research Institute Maastricht, Department of Physiology, Maastricht University, PO Box 616, 6200 MD Maastricht, Netherlands.
2 Department of Biochemistry, Maastricht University, PO Box 616, 6200 MD Maastricht, Netherlands.
3 Angiogenesis Laboratory, Department of Medical Oncology, VU University Medical Center, PO Box 7057, 1007 MB, Amsterdam, Netherlands.
4 Cardiovascular Research Institute Maastricht, Department of Physiology, Maastricht University, PO Box 616, 6200 MD Maastricht, Netherlands. Electronic address: m.oudeegbrink@maastrichtuniversity.nl.