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Problem
The role of vitamin D (VD) in IVF outcome and immune parameters has not been elucidated well.
Method of study
Women undergoing IVF treatment with GnRH agonist (Agonist) and progestin‐primed ovarian stimulation (PPOS) protocols were divided into VD lower (VDL, 25(OH)VD ≤20 ng/mL) and VD higher (VDH, 25(OH)VD >20 ng/mL) groups. Follicular fluid (FF) VD level, IVF outcomes, and peripheral...
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