1. Department of Stem Cell Biology and Regenerative Medicine, Graduate School of Medical Science, Kansai Medical University, Moriguchi, Osaka, Japan
2. Department of Pediatrics, Kansai Medical University, Moriguchi, Osaka, Japan
3. Department of Surgery, Kansai Medical University, Moriguchi, Osaka, Japan
4. Division of Immunology, Aichi Cancer Center Research Institute, Nagoya, Aichi, Japan