Topical imiquimod before intradermal trivalent influenza vaccine for protection against heterologous non-vaccine and antigenically drifted viruses: a single-centre, double-blind, randomised, controlled phase 2b/3 trialIvan Fan‐Ngai Hung, Kwok‐Yung Yuen, Brian Chun-Yuan Chan et al.|The Lancet Infectious Diseases|2015Cited by 82