FLAG Review 2019 - Flavour Lattice Averaging Group (FLAG) S. Aoki, Y. Aoki, D. Bečirević, T. Blum, G. Colangelo, S. Collins, M. Della Morte, P. Dimopoulos, S. Dürr, H. Fukaya et al. (25 more) Eur. Phys. J. C, 80 2 (2020) 113 Published online: 11 February 2020 DOI: 10.1140/epjc/s10052-019-7354-7