Endometrial preparation, FET timing and patient randomization
endometrial thickness
This study included only FETs in an artificially supplemented cycle (FET-HRT). Thus, endometrial preparation consisted of the sequential administration of oestradiol (EStudy design flowchart. E2 (oestradiol), P (progesterone), ET (endometrial thickness), FSH (follicular stimulating hormone), LH (luteinizing hormone), FET (frozen embryo tranfer)