Sample size calculations were based on the primary outcomes of diagnostic yield and sensitivity as well as the secondary outcome of impact on pain symptoms. The sample size is largely driven by the primary outcome of diagnostic yield. A sample size of 170 will provide 90% power to detect an improvement in diagnostic yield of 20% (95% CIs 72%-85% white light and 95%-100% NBI), based on a randomization scheme of 3:1 for white light/NBI versus white light/white light examination. This sample size takes into consideration a 25% drop out/not evaluable rate for the following reasons: incomplete visualization of the pelvis, loss to follow-up for pain assessment or patients not evaluable for pain assessment (a subset of infertility patient who may not have pain as a presenting symptom).