1. Department of Cardiac Surgery, Centre Cardiologique du Nord de Saint-Denis, Paris, France
2. Department of Cardiovascular Surgery, University Campus Bio-Medico of Rome, Rome, Italy
3. Institute for Polymers, Composites and Biomaterials, National Research Council of Italy, Rome, Italy
4. Department of Structures for Engineering and Architecture and Interdisciplinary Research Center for Biomaterials, Università di Napoli ‘Federico II’, Naples, Italy
5. Banc de Tissus Humains Hopital Saint Louis, Paris, France
6. Department of Cardiothoracic Surgery, Golden Jubilee National Hospital, Glasgow, UK
7. Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, UK
8. Department of Cardiac Surgery, Hopital La Pitie Salpetriere, Paris, France
9. Deptartment of cardiovascular surgery, University Hospital of Bern, Bern, Switzerland