NCT02752568.

Study name	Assisted hatching versus endometrial scratch in recurrent implantation failure
Methods	RCT
Participants	Recurrent implantation failure patients undergoing IVF
Interventions	Intervention: mid luteal endometrial scratch using Novak curette under general anaesthesia in the cycle preceding stimulation Control: no procedure (third group of assisted hatching not relevant for this review)
Outcomes	Positive pregnancy test
Starting date	May 2016
Contact information	Suzy Abdelaziz: suzyabdelaziz92@gmail.com
Notes	Trial registration status on3 July 2020: unknown Author correspondence attempted but unsuccessful