Additional file 4: of The impact of repeated vaccination on influenza vaccine effectiveness: a systematic review and meta-analysis RamsayLauren BuchanSarah StirlingRobert CowlingBenjamin FengShuo KwongJeffrey WarshawskyBryna 2019 Table S2. Meta-analysis pooled results by influenza season and influenza type/subtype (DOCX 26 kb)