[1] Hosp Clin Barcelona, Barcelona, Spain
[2] Bellvitge Univ Hosp, Barcelona, Spain
[3] Hosp Santa Creu & Sant Pau, Barcelona, Spain
[4] Hosp Meixoeiro, Vigo, Spain
[5] Hosp Clin San Carlos, Madrid, Spain
[6] Gen Univ Hosp Alicante, Alicante, Spain
[7] Univ Hosp Ferrara, Ferrara, Italy
[8] Cardialysis BV, Rotterdam, Netherlands
[9] Erasmus Univ, Thoraxctr, Erasmus Med Ctr, Dept Cardiol, NL-3000 DR Rotterdam, Netherlands