Mahran 2016.

Methods	RCT
Participants	218 women undergoing their first IVF cycle (confirmed by author correspondence as not listed as eligibility criteria but stated in title of paper)
Interventions	Study group: pipelle performed between days 21‐24 of the cycle prior to the IVF cycle Control group: no procedure during luteal phase Note: all women underwent hysteroscopy 2‐5 days post menstruation in both groups
Outcomes	Live birth, clinical pregnancy, multiple pregnancy, miscarriage, pain, bleeding (paper states no participants had heavy bleeding, while spotting was common ‐ no data provided). Author confirmed numbers of live births and clinical pregnancies as only percentages provided in the paper
Notes	Trial registration: ISRCTN61316186 (registered Jun 2015, registered retrospectively) Individual participant data were provided for this trial as part of a separate review project (PROSPERO 2017 CRD42017079120), in which some of the current authors are also involved. In doing so, the review team identified discrepancies between the raw data and the published manuscript which could not be resolved following correspondence with the authors. We therefore elected to place the study in awaiting classification.