1. Department of Respiratory Medicine, National Hospital Organization Nagoya Medical Center, Nagoya, Aichi 460-0001, Japan
2. Department of Respiratory Medicine, Sohag University Hospital, Nasr City Street, Sohag 82524, Egypt
3. Department of Respiratory Medicine and Clinical Immunology, Toyota Kosei Hospital, 500-1 Ibohara Josuicho, Toyota-Shi 470-0396, Japan