[1] Tokushima Univ Hosp, Resp Med & Rheumatol, Tokushima, Japan
[2] Natl Hosp Org Kochi Hosp, Dept Clin Invest, Kochi, Japan
[3] Tokushima Prefectural Cent Hosp, Resp Med, Tokushima, Japan
[4] Japanese Red Cross Matsuyama Hosp, Resp Med, Matsuyama, Ehime, Japan
[5] St Lukes Int Hosp, Thorac Ctr, Tokyo, Japan
[6] Japanese Red Cross Kochi Hosp, Internal Med, Kochi, Japan
[7] Shikoku Cent Hosp, Resp Med, Matsuyama, Ehime, Japan