Hollow fiber vitrification: A novel method for vitrifying multiple embryos in a single device - Matsunari, H; Maehara, M; Nakano, K; Ikezawa, Y; Hagiwara, Y; Sasayama, N; Shirasu, A; Ohta, H; Takahashi, M; Nagashima, H (J Reprod Dev, 2012)