Youssef 2018.

Methods	RCT
Participants	Unexplained recurrent implantation failure undergoing ICSI
Interventions	Study group: endometrial scratch was done in luteal phase of the cycle prior to controlled ovarian hyper stimulation using endometrial bunch biopsy forceps through office hysteroscopy using vaginoscopic approach. Control group: unclear
Outcomes	Live birth, clinical pregnancy, miscarriage
Notes	Presented as an abstract only with limited methodological detail. Described as an RCT quote: "Patients randomized in 2 equal groups using computer generating table". A total of 200 women included however numbers in each arm unclear and pregnancy rates etc provided as percentages only. Therefore, unclear if truly an RCT and data cannot be used as reported. Note: same authoring team as Shawki 2018; appearing in same conference proceedings.

ICSI: intracytoplasmic sperm injection; IVF: in vitro fertilisation; RCT: randomised controlled trial; RIF: recurrent implantation failure.