[1] Duke Univ, Med Ctr, Div Pulm Allergy & Crit Care Med, Durham, NC 27710 USA
[2] United Therapeutics Corp, Res Triangle Pk, NC USA
[3] Tongji Univ, Sch Med, Shanghai Pulm Hosp, Shanghai 200092, Peoples R China
[4] Beijing Union Med Coll Hosp, Beijing, Peoples R China
[5] Capital Med Univ, Beijing Shijitan Hosp, Dept Pulm Vasc Dis, Beijing, Peoples R China
[6] Arizona Pulm Specialists Ltd, Phoenix, AZ USA
[7] Natl Inst Hlth Res, Cardiovasc Biomed Res Unit, Sheffield, S Yorkshire, England
[8] Sheffield Teaching Hosp NHS Fdn Trust, Royal Hallamshire Hosp, Sheffield Pulm Vasc Dis Unit, Sheffield, S Yorkshire, England
[9] St Vincents Hosp, Heart Lung Clin, Sydney, NSW 2010, Australia
[10] UC San Diego Med Ctr, San Diego, CA USA