HumanMetagenomeDB: a public repository of curated and standardized metadata for human metagenomes. - Jonas Coelho Kasmanas; Alexander Bartholomäus; Felipe Borim Corrêa; Tamara L. Tal; Nico Jehmlich; Gunda Herberth; Martin von Bergen; Peter F. Stadler; André Carlos Ponce de Leon Ferreira de Carvalho; Ulisses Nunes da Rocha (Nucleic Acids Res., 2021)