In this task, you are given a passage which has a question and the context. You have to generate an answer to the question based on the information present in the context.

Context: Increased progesterone level during follicular phase seemed to be associated with decreased pregnancy rate.', 'A prospective cohort study, 1.1.2012 - 31.8.13. The Progesterone (P) and Progesterone/Estrogen (P/E2) level on ovulation induction day were compared between the protocols and the different gonadotropins used. Roc analysis was calculated to determine the cutoff of P/E2 to predict delivery rates. P/E2 ratio was calculated as PX1000/e2 level.', 'One hundred thirty-nine patients were enrolled to the study. No difference in the P level at hCG stimulation day between different protocols, however, E2 and P/E2 ratio were significantly lower in the long protocol compare with antagonist protocol 1757.7923.2 vs. 1342.91223; P=0.003 and 0.480.31 vs. 0.830.87; P=0.038). The endometrium was significantly thicker in the long group compare with short and antagonist. Significantly more top-quality embryos (TOP) were achieved in the antagonist group. Comparable results between the types of gonadotropins used in regards with cycle characteristics and pregnancy and delivery rates. The P/E2 ratio which can predict live birth rate was found to be 0.45, AUC=0.632, p=0.02 and 95% CI 0.525-0.738 and a significantly higher pregnancy and delivery rates at a P/E2 bellow 0.45.\Question: Is late follicular progesterone to estradiol ratio influenced by protocols or gonadotropins used?
Endometrial receptivity is determined by the complex interactions of E2 and P.