Benjamin J. Cowling
['Retraction Note: The impact of repeated vaccination on influenza vaccine effectiveness: a systematic review and meta-analysis', 'Benjamin J. Cowling', 'English', '2018-08-12', 'The impact of repeated vaccination on influenza vaccine effectiveness: a systematic review and meta-analysis', 'retraction notice', 'Retraction Note: The impact of repeated vaccination on influenza vaccine effectiveness: a systematic review and meta-analysis']