1. Department of Cardiac Surgery, University of Rostock, Rostock, Germany.
2. Miltenyi Biotec, Bergisch Gladbach, Germany.
3. Helmholtz Institute of Biomedical Technology–Cellbiology, Aachen University of Technology, Aachen, Germany.
4. Division of Cardiovasculary Surgery, Toronto General Hospital and the University of Toronto, Toronto, Canada.
5. Institute of Polymer Research, GKSS Forschungszentrum, Teltow, Germany.