[1] Harvard Med Sch, Massachusetts Gen Hosp, Dept Med, Div Pulm & Crit Care Med, Boston, MA 02115 USA
[2] Harvard Med Sch, Beth Israel Deaconess Med Ctr, Dept Med, Div Pulm Crit Care & Sleep Med, Boston, MA 02115 USA
[3] Washington Univ, Sch Med, Dept Pediat, St Louis, MO 63110 USA
[4] Univ Missouri, Sch Med, Dept Child Hlth, Columbia, MO USA
[5] Univ Hong Kong, Dept Med, Hong Kong, Peoples R China
[6] Yonsei Univ, Wonju Coll Med, Dept Pathol, Wonju, South Korea
[7] Hyogo Coll Med, Dept Resp Med, Nishinomiya, Hyogo, Japan
[8] Johns Hopkins Sch Med, Dept Med, Div Pulm & Crit Care Med, Baltimore, MD USA
[9] Kyoto Univ, Hosp Med, Dept Phys Therapeut, Kyoto, Japan
[10] Univ Occupat & Environm Hlth, Kitakyushu, Fukuoka, Japan
[11] Zhongshan Hosp, Dept Pulm Med, Shanghai, Peoples R China
[12] Fudan Univ, Shanghai, Peoples R China
[13] Boston Univ, Sch Med, Dept Med, Div Allergy Pulm Crit Care & Sleep Med, Boston, MA USA
[14] Kangwon Natl Univ Hosp, Dept Internal Med, Chunchon, South Korea
[15] Metro North Hosp & Hlth Serv, Prince Charles Hosp, Brisbane, Qld, Australia
[16] Univ Queensland, Thorac Res Ctr, Prince Charles Hosp, Brisbane, Qld, Australia