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How to define the "Poor Ovarian Response"?

"Why do I have only a few follicles developed in this cycle?"

"Why my stimulated follicles seems less than the last cycle?"

Some patients had poor response to the controlled ovarian stimulation, and thus they underwent the treatment almost per month to collect available oocytes. These patients were defined as the group of potential " poor ovarian response (POR)." In 2011, the European Society of Human Reproduction and Embryology (ESHRE) defined these patients based on the standard criteria, which were called "Bologna Criteria,"

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