**Author details**

Jing Zhu, Mengxia Ji, Lili Xing, Zhizhi Yu, Xiaoyan Guo, Xiaopan Chen\* and Jing Shu\* Department of Reproductive Endocrinology, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang, China

\*Address all correspondence to: chenxiaopan@hmc.edu.cn and shujing@hmc.edu.cn

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
