Allele frequency net database (AFND) 2020 update: gold-standard data classification, open access genotype data and new query tools. - Faviel F. Gonzalez-Galarza; Antony McCabe; Eduardo José Melo dos Santos; James Jones; Louise Y. C. Takeshita; Nestor D. Ortega-Rivera; Glenda M. Del Cid-Pavon; Kerry Ramsbottom; Gurpreet S. Ghattaoraya; Ana Alfirevic; Derek Middleton; Andrew R. Jones (Nucleic Acids Res., 2020)