Examination of the Relationship between the Invisibility or Location of Visualized Meiotic Spindle in Living Human Oocytes and Embryonic Development after ICSI Hatori, Akiko and Takahashi, Lkue and Nakano, Hideyuki, Journal of Mammalian Ova Research, 28, 219-223 (2011), DOI:http://dx.doi.org/10.1274/jmor.28.219