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- February 29, 2016.
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- 1Yale School of Medicine, Department of Obstetrics, Gynecology, & Reproductive Sciences, 333 Cedar Street, Tompkins 2-203, New Haven, CT, 06520-8063, USA
- 2Center of Reproductive Medicine, Department of Gynecology and Obstetrics, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
- 3Department of Statistics, Yale University, 24 Hillhouse Avenue, Room B06, New Haven, CT, 06520, USA