[1] Kochi Univ, Kochi Med Sch, Dept Hematol & Resp Med, Nankoku, Kochi 7838505, Japan
[2] Natl Okayama Med Ctr, Dept Cardiol, Okayama, Japan
[3] Okayama Univ, Grad Sch Med & Dent, Dept Canc & Thorac Surg, Okayama, Japan
[4] Kochi Univ, Kochi Med Sch, Dept Tumor Pathol, Nankoku, Kochi 7838505, Japan