[1] Hokkaido Red Cross Blood Ctr, Nishi Ku, Sapporo, Hokkaido 0630002, Japan
[2] Asahikawa Med Coll, Dept Paediat, Asahikawa, Hokkaido 078, Japan
[3] Asahikawa Med Coll, Dept Clin Med, Asahikawa, Hokkaido 078, Japan
[4] Hitachi Kasei, Tokyo, Japan
[5] Nissho Corp, Shiga, Japan
[6] Int Canc Ctr Lab, Tokyo, Japan