1. Graduate School of Comprehensive Human Science, Laboratory of Regenerative Medicine and Stem Cell Biology, University of Tsukuba, Tsukuba, Japan.
2. PhD Program in Human Biology, University of Tsukuba, Tsukuba, Japan.
3. Department of Obstetrics and Gynecology, University of Tsukuba.
4. Department of Cardiovascular Surgery, University of Tsukuba, Tsukuba, Japan.