[1] Nagasaki Univ, Dept Mol Microbiol & Immunol, Grad Sch Biomed Sci, Nagasaki 852, Japan
[2] Nagasaki Univ, Sch Med, Dept Internal Med 2, Nagasaki 852, Japan
[3] Nagasaki Univ, Sch Med, Dept Lab Med, Nagasaki 852, Japan
[4] Hokusho Chuo Hosp, Nagasaki, Japan