Seasonal influenza vaccination in older people: A systematic review and meta-analysis of the determining factors Okoli, George N. ; Lam, Otto L. T. ; Racovitan, Florentin ; Reddy, Viraj K. ; Righolt, Christiaan H. ; Neilson, Christine ; Chit, Ayman ; Thommes, Edward ; Abou-Setta, Ahmed M. ; Mahmud, Salaheddin M. Abstract Publication: PLoS ONE Pub Date: June 2020 DOI: 10.1371/journal.pone.0234702 Bibcode: 2020PLoSO..1534702O