1. Center for Stem Cell Biology and Regenerative Medicine, Institute of Medical Science at the University of Tokyo, Tokyo, Japan;
2. Department of Coloproctological Surgery, Juntendo University Faculty of Medicine, Tokyo, Japan;
3. Department of Stem Cell Dynamics, Center for Stem Cell Biology and Regenerative Medicine, Institute of Medical Science at the University of Tokyo, Tokyo, Japan;
4. United Centers for Advanced Research and Translational Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; and
5. Atopy (Allergy) Center, Juntendo University School of Medicine, Tokyo, Japan