1. a Department of Vascular Regeneration, Division of Tissue Engineering, The University of Tokyo Hospital, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan; Biomaterial System Group, Biomaterials Center, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
2. b Department of Sensory & Motor System Medicine, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan
3. c Department of Vascular Regeneration, Division of Tissue Engineering, The University of Tokyo Hospital, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan; Division of Vascular Surgery, Department of Surgery, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan. hkoyama-tky@umin.ac.jp
4. d Division of Vascular Surgery, Department of Surgery, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan
5. e Department of Vascular Regeneration, Division of Tissue Engineering, The University of Tokyo Hospital, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan; Department of Sensory & Motor System Medicine, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan