 | Bern University Hospital Principal Investigator: prof. dr. J. Schmidli Department of Cardiovascular Surgery Bern Switzerland |
 | University Hospital Zurich Principal Investigator: prof. dr. M. Lachat Department of Cardiovascular Surgery Zurich Switzerland |
 | Lausanne University Hospital Principal Investigator: dr. F. Saucy Department of Thoracic and Vascular Surgery Lausanne Switzerland |
Awaiting Local MEC Approval
 | Hopitaux Universitaires de Genève Principal Investigator: dr. N. Murith Department of Cardiac Surgery Geneva Switzerland |