Von Wolff 2009.

Methods	Parallel group study Number of women randomised: 168 (84 in the intervention group; 84 in the control group) Number of cancellations: 31 cycles (14 in the intervention group, 17 in the control group) which did not reach embryo transfer Number of cycles analysed: 133
Participants	Country of authors: Germany Inclusion criteria: women aged 18 to 42 years, in a stable relationship Exclusion criteria: cancellation of embryo transfer due to total fertilisation failure or pending OHSS, Hepatitis B, or C or HIV infection or leukocytospermia in the male partner, seminal plasma volume < 0.5 ml Mean age (SD not reported): intervention group: 34.4 years; control group: 34.1 years Mean duration of infertility: not reported Women with primary infertility: not reported Setting: ART Center of the Women's University Hospital, Heidelberg, Germany
Interventions	Intervention: 0.5 ml seminal plasma application into the cervical canal by an intrauterine insemination catheter right after oocyte pick‐up. The rest of SP was applied at the posterior fornix. Comparator: saline application in the same way.
Outcomes	Clinical pregnancy
Notes	We tried to contact the authors by email, twice one month apart, however did not receive a response.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Stratified, block randomisation using lists
Allocation concealment (selection bias)	Unclear risk	Authors did not report that allocation concealment was used during the trial
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Identical looking placebo was used
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Objective outcome measure
Incomplete outcome data (attrition bias) All outcomes	Low risk	10 to 30% attrition with reasons. Similar rate between the two groups
Selective reporting (reporting bias)	Low risk	Clinical pregnancy rate reported
Other bias	Low risk	No other cause of potential bias identified