1. Department of Stem Cells and Human Disease Models, Research Center for Animal Life Science, Shiga University of Medical Science, Shiga 520-2192, Japan
2. Department of Obstetrics and Gynecology, Shiga University of Medical Science, Shiga 520-2192, Japan
3. Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto 606-8501, Japan