Sample size calculation
We calculated sample-size by two independent proportions. Using the estimated livebirth rate of 25% with neosalpingostomy and 53% with salpingectomy based on previous literature, and assuming an alpha level of 0.05 for two-sided test, we calculated that a sample of 88 cases who underwent therapy would result in 80% power (1:1 ratio). The sample size was increased to 110 (two groups of 55) to allow for a 20% rate of loss to follow-up over the long time period.