[1] Hannover Med Sch, Hannover, Germany
[2] Univ Dundee, Dundee, Scotland
[3] Hosp Univ Vall dHebron, Barcelona, Spain
[4] Univ Milan, Milan, Italy
[5] Newcastle Univ, Newcastle Upon Tyne, Tyne & Wear, England
[6] Hosp Josep Trueta, Girona, Spain
[7] AZ Nikolaas, St Niklaas, Belgium
[8] Med Ctr Alkmaar, Alkmaar, Netherlands
[9] Papworth Hosp, Cambridge, England
[10] CHU Toulouse, Hop Larrey, Toulouse, France
[11] Chest Dis Hosp, Athens, Greece
[12] Royal Infirm, Edinburgh, Midlothian, Scotland
[13] Hosp Univ La Fe, Valencia, Spain
[14] Hosp Clin Barcelona, Barcelona, Spain
[15] Imperial Coll, London, England
[16] Royal Brompton Hosp, London, England