Letrozole increases preantral follicle growth and decreases estradiol production without impairing follicle survival oleh Fukiko Kasuga-Yamashita, Tsuyoshi Baba, Sachiko Nagao, Yuya Fujibe, Miyuki Morishita, Yoshika Kuno, Tasuku Mariya, Hiroyuki Honnma, Toshiaki Endo, Tamotsu Kiya, Tsuyoshi Saito