1. Institute for Advanced Biosciences, Keio University, Tsuruoka, Japan
2. Systems Biology Program, Graduate School of Media and Governance, Keio University, Fujisawa, Japan
3. Intestinal Microbiota Project, Kanagawa Institute of Industrial Science and Technology, Kawasaki, Japan
4. Transborder Medical Research Center, University of Tsukuba, Tsukuba, Japan
5. Faculty of Environment and Information Studies, Keio University, Fujisawa, Japan