[1] Settorato Int, Catania, Italy
[2] Royal Victoria Infirm, Freeman Cardiothorac Ctr, Newcastle Upon Tyne NHS Hopsitals Trust, Newcastle Upon Tyne NE1 4LP, Tyne & Wear, England
[3] Wythenshawe Hosp, UHSM, Manchester M23 9LT, Lancs, England
[4] Papworth Everard, Cambridge, England
[5] Univ Hosp Birmingham, Sch Med, Birmingham, W Midlands, England
[6] St Orsola Marcello Malpighi Hosp, Bologna, Italy
[7] Univ Bari, Bari, Italy
[8] Ctr Hosp Univ Dupuytren, Limoges, France
[9] Inst Univ Pathol Lausanne, Lausanne, Switzerland
[10] Yuksek Ihtisas Hosp, Ankara, Turkey
[11] Univ Padua, Padua, Italy
[12] Azienda ULSS 18, Rovigo, Italy