[1] Univ Hosp S Orsola, Dept Cardiac Surg, Bologna, Italy
[2] IRCCS Policlin San Donato, Thorac Aort Rsch Cntr, Rsch Cntr Thorac Aort Dis, San Donato Milanese, Italy
[3] St Michaels Hosp, Div Cardiac Surg, Toronto, ON M5B 1W8, Canada
[4] Univ Tromso Hosp, N-9012 Tromso, Norway
[5] Duke Univ, Med Cntr, Div Thorac & Cardiovasc Surg, Durham, NC USA
[6] Hadassah Hebrew Univ Med Cntr, Jerusalem, Israel
[7] Massachusetts Gen Hosp, Thorac Aort Cntr, Boston, MA 02114 USA
[8] Mayo Clin, Rochester, MN USA
[9] Univ Calgary, Med Cntr, Div Cardiac Surg, Calgary, AB, Canada
[10] Univ Chicago, Med Cntr, Chicago, IL 60637 USA
[11] Univ Michigan, MCORRP, Cardiovasc Cntr, Ann Arbor, MI 48109 USA
[12] Univ Michigan, Cardiovasc Cntr, Ann Arbor, MI 48109 USA
[13] Univ Rostock, D-18055 Rostock, Germany
[14] Univ Michigan, Dept Cardiac Surg, Ann Arbor, MI 48109 USA