Development of a novel vitrification method for chondrocyte sheets - Maehara, M; Sato, M; Watanabe, M; Matsunari, H; Kokubo, M; Kanai, T; Sato, M; Matsumura, K; Hyon, S H; Yokoyama, M; Mochida, J; Nagashima, H (BMC Biotechnol, 2013)