[1] Bologna Univ Hosp, Insititute Cardiol, Bologna, Italy
[2] Hannover Med Sch, Dept Resp Med, D-3000 Hannover, Germany
[3] Univ London Imperial Coll Sci Technol & Med, Natl Heart & Lung Inst, London, England
[4] Hammersmith Hosp, London, England
[5] S Paris Univ, Hop Antoine Beclere, Natl Reference Ctr Pulm Hypertens, Dept Pneumatol, Paris, France
[6] S Paris Univ, Hop Antoine Beclere, Natl Reference Ctr Pulm Hypertens, Dept ICU, Paris, France