Lansbury, L E, Smith, S, Beyer, W, Karamehic, E, Pasic-Juhas, E, Sikira, H, Mateus, A L P, Oshitani, H, Zhao, H, Beck, C R, Nguyen-Van-Tam, J S, "Effectiveness of 2009 pandemic influenza A(H1N1) vaccines: A systematic review and meta-analysis", VACCINE, 2017