[1] Kings Coll London, London, England
[2] Univ Milan, Milan, Italy
[3] Hosp La Fe, Valencia, Spain
[4] Hop Cochin, Paris, France
[5] Hannover Med Sch, Hannover, Germany
[6] Newcastle Univ, Newcastle Upon Tyne, Tyne & Wear, England
[7] Technion Israel Inst Technol, Haifa, Israel
[8] Univ Dundee, Dundee, Scotland
[9] Hosp Trueta Girona, Girona, Spain
[10] Hosp VallHebron, Barcelona, Spain
[11] Papworth Hosp NHS, Cambridge, England
[12] Thorac Dis Gen Hosp Sotiria, Athens, Greece
[13] Royal Brompton Hosp, London, England
[14] Hosp Clin Barcelona, Barcelona, Spain
[15] Queens Univ Belfast, Belfast, Antrim, North Ireland
[16] AZ Nikolaus, St Niklaas, Belgium
[17] Univ San Jorge, Zaragoza, Spain