1. Division of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Japan Society for the Promotion of Science, Tokyo
2. Division of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo
3. Division of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Department of Pulmonary Medicine, Eiju General Hospital, Tokyo
4. Center for Infectious Diseases and Infection Control, Keio University School of Medicine, Tokyo, Japan