1. Department of Pathology, Sapporo Medical University School of Medicine, Chuo-Ku, Sapporo 060-8556, Japan
2. Department of Surgery, Sapporo Medical University School of Medicine, Chuo-Ku, Sapporo 060-8556, Japan
3. The Molecular Medicine Team, Research Center for Medical Glycoscience, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan