1 Division of Fundamental Health Sciences, School of Nursing and Social Services, Health Sciences University of Hokkaido, Kanazawa 1757, Tobetsu, Hokkaido, 061-0293, Japan. r-mori@hoku-iryo-u.ac.jp.
2 Department of Pathology, Otaru General Hospital, Otaru, Japan. r-mori@hoku-iryo-u.ac.jp.
3 Department of Pathology, Otaru General Hospital, Otaru, Japan.