1. Center of Molecular and Vascular Biology (K.F., B.I., C.T., C.W., C.V.G.), University Hospital Gasthuisberg, University of Leuven, B-3000 Leuven, Belgium
2. Department of Pediatrics (J.J., M.V.H., F.d.Z., C.V.G.), University Hospital Gasthuisberg, University of Leuven, B-3000 Leuven, Belgium