[1] Sapporo Med Univ, Sch Med, Dept Orthopaed Surg, Lab Biomed Engn,Chuo Ku, Sapporo, Hokkaido 0608543, Japan
[2] Sapporo Med Univ, Sch Med, Div Clin Pathol, Sapporo, Hokkaido 0608543, Japan
[3] Toyama Med & Pharmaceut Univ, Dept Orthopaed Surg, Toyama, Japan
[4] Toyama Med & Pharmaceut Univ, Dept Pathol, Toyama, Japan
[5] Higashi Sapporo Hosp, Div Internal Med, Sapporo, Hokkaido, Japan