1. Helen and Arthur E. Johnson Beth-El College of Nursing and Health Sciences; University of Colorado; Colorado Springs CO USA
2. Department of Medicine; National University Hospital; Singapore
3. Department of Medicine and Therapeutics; The Chinese University of Hong Kong; Hong Kong
4. Research Institute for Diseases of the Chest, Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan
5. Department of Medicine; The University of Hong Kong; Hong Kong
6. Department of Pharmacology and Pharmacy; The University of Hong Kong; Hong Kong