Cross-talk between Bone Marrow and Tissue Injury : Novel Regenerative Therapy for Severely Damaged Tissues by Mobilizing Bone Marrow Mesenchymal Stem Cells in Vivo [Innovation in Transplant and Regenerative Medicine. The 13th Meeting of Hirosaki International Forum of Medical Science. Communication Center of Hirosaki University School of Medicine. September 9, 2011, Hirosaki, Japan]