Vereschagin 1991.

Methods	Randomised: methods of randomisation and allocation concealment were not described. Double‐blind Placebo‐controlled Duration: 4 weeks
Participants	Number of participants: 60 participants were divided equally into 2 groups. Inclusion: patients with a mild form of multi‐infarct dementia, but the diagnosis criteria were not described. Baseline: the study groups had similar baseline compared parameters.
Interventions	Cere group: Cere 15 mL (10 mL in the morning and 5 mL in the evening) + 0.85% NaCl solution 200 mL Placebo group: placebo 15 mL (10 mL in the morning and 5 mL in the evening) + 0.85% NaCl solution 200 mL i.v. infusions twice daily for 28 days.
Outcomes	Clinical evaluations (by means of a special scale) EEG Psychological test of Arnold‐Kohlmann Response times
Notes	Only an abstract was found. Despite our efforts, detailed information could not be obtained.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Despite contacting study authors, detailed methods were not available.
Allocation concealment (selection bias)	Unclear risk	Despite contacting study authors, detailed methods were not available.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Despite contacting study authors, detailed methods were not available.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Despite contacting study authors, detailed methods were not available.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Despite contacting study authors, details were not available.
Selective reporting (reporting bias)	Unclear risk	Despite contacting study authors, details were not available.
Other bias	Unclear risk	Despite contacting study authors, details were not available.