Selkova 2005b.

Methods	Randomised, placebo‐controlled trial of Oscillococcinum® in the prevention of influenza‐like illness
Participants	227 students (aged 16 to 22 years), at medical school, Kalouga, Russia; not vaccinated against influenza
Interventions	Oscillococcinum®, prophylactically, once per week for 4 weeks
Outcomes	Number of participants who fell ill with influenza symptoms
Notes	Methodological details for each study are scantily described, but the tabulations of key results for each are clearly presented Research setting: Medical School, Kalouga, Russia
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	No information on actual randomisation method. The description "two similar groups...were randomly constituted" is equivocal
Allocation concealment (selection bias)	Unclear risk	No description of allocation procedure
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	No description of blinding procedure
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No description of blinding procedure
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Insufficient information provided
Selective reporting (reporting bias)	Unclear risk	Insufficient information provided
Other bias	Unclear risk	Insufficient information provided