1. Department of Respiratory Medicine, Kanagawa Cardiovascular and Respiratory Center, Yokohama, Kanagawa 236‑0051, Japan
2. Department of Internal Medicine, Mito Medical Center, University of Tsukuba, Tsukuba, Ibaraki 310‑0015, Japan
3. Department of Pathology, Graduate School of Medicine, Yokohama City University, Yokohama, Kanagawa 236‑0004, Japan
4. Department of Radiology, Kanagawa Cardiovascular and Respiratory Center, Yokohama, Kanagawa 236‑0051, Japan