1. Department of Pathology and Laboratory Medicine, Boston University School of Medicine, Boston, Massachusetts.
2. Department of Physiology and Biophysics, Boston University School of Medicine, Boston, Massachusetts.
3. Primary affiliation, Institute of Molecular Biology, National Chung Hsing University, Taichung, Taiwan.
4. Primary affiliation, Department of Medicine, Boston University School of Medicine, Boston, Massachusetts.
5. Current address, Pulmonary and Critical Care Unit, Massachusetts General Hospital, Boston, Massachusetts.