1. Department of Physical Therapy, School of Behavioral and Applied Sciences, Azusa Pacific University, Azusa, United States
2. Division of Pulmonary and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, USA
3. Johns Hopkins Bloomberg School of Public Health, Baltimore, USA
4. Section of Pulmonary Medicine, University of Vermont Larner College of Medicine, Burlington, United States
5. Pulmonary, Allergy and Critical Care Medicine, Duke University School of Medicine Pulmonary Division, Durham, USA
6. Division of Internal Medicine, The University of California San Diego, San Diego, USA
7. Department of Asthma and Airway Disease Research Center, Mel & Enid Zuckerman College of Public Health and the Asthma and Airway Disease Research Center, the University of Arizona, Tucson, USA
8. Section of Pulmonary and Critical Care Medicine, Baylor College of Medicine, Houston, United States