Dr. Carla Roberts, a reproductive endocrinology and infertility specialist and the chief of service at Emory University Hospital Midtown in Atlanta, said she is always mindful about the age of her patients.

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"Most of the time, the things that win the Nobel Prize are esoteric, " said Marcelle Cedars at the University of California, San Francisco, who is incoming president of the Society of Reproductive Endocrinology and Infertility.

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