1 Division of Pulmonary and Critical Care Medicine, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
2 Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
3 Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA.
4 Department of Child Health, The University of Missouri School of Medicine, Columbia, MO, USA.
5 Department of Medicine, University of Hong Kong, Hong Kong.
6 Department of Pathology, Wonju College of Medicine, Yonsei University, Wonju, South Korea.
7 Department of Respiratory Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan.
8 Division of Pulmonary and Critical Care Medicine, Department of Medicine, John Hopkins School of Medicine, Baltimore, MD, USA.
9 Department of Physical Therapeutics, Kyoto University Hospital of Medicine, Kyoto, Japan.
10 University of Occupational and Environmental Health, Kitakyushu, Japan.
11 Department of Pulmonary Medicine, Zhongshan Hospital, Shanghai, China.
12 Fudan University, Shanghai, China.
13 Division of Allergy, Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, Boston University School of Medicine, Boston, MA, USA.
14 Department of Internal Medicine, Kangwon National University Hospital, Chuncheon, South Korea.
15 The Prince Charles Hospital, Metro North Hospital and Health Service, Brisbane, QLD, Australia.
16 The University of Queensland Thoracic Research Centre at The Prince Charles Hospital, Brisbane, QLD, Australia.