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Natl Hosp Org, Ibaraki Higashi Natl Hosp, Dept Resp Med, Ibaraki 3191113, Japan
Univ Tsukuba, Fac Med, Dept Pulm Med, Tsukuba, Ibaraki 3058576, Japan
Natl Hosp Org, Ibaraki Higashi Natl Hosp, Dept Resp Med, 825 Terunuma, Ibaraki 3191113, Japan Natl Hosp Org, Ibaraki Higashi Natl Hosp, Dept Resp Med, Ibaraki 3191113, Japan