The ASVspoof 2019 database. - Xin Wang 037; Junichi Yamagishi; Massimiliano Todisco; Héctor Delgado; Andreas Nautsch; Nicholas W. D. Evans; Md. Sahidullah; Ville Vestman; Tomi Kinnunen; Kong Aik Lee; Lauri Juvela; Paavo Alku; et al. (CoRR, 2019)