**Author details**

Feng Gao Reproductive Medicine Associates of Northern California (RMA), San Francisco, USA

\*Address all correspondence to: fgao@ivirma.com

© 2022 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.

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## **Chapter 3**
