NCT02107521.

Methods	Double‐blind, randomised trial conducted in a private fertility centre (Brazil)
Participants	Eligibility criteria: patients with ICSI indication, who have previously undergone at least one ICSI attempt, during which at least 2 blastocysts were transferred, with no implantation; regular menstrual cycles every 25 to 35 days; BMI < 35kg/m²; presence of both ovaries; no pelvic or clinically significant uterine anomalies, or both; normal cervical cytology; FSH within normal limits
Interventions	Couples were randomised into 2 groups: Intervention: sperm selection in the ICSI group was analysed under 6600x magnification Control: sperm selection in the ICSI group was analysed under 400x magnification
Outcomes	Implantation rate
Notes	According to ClinicalTrials.gov, study was terminated due to broken equipment. We contacted the authors, but we did not receive an answer by the completion of the present review.