Reference:
  Author: Duy Tin Truong and Eric A Franzosa and Timothy L Tickle and Matthias Scholz and George Weingart and Edoardo Pasolli and Adrian Tett and Curtis Huttenhower and Nicola Segata
  Title: "MetaPhlAn2 for enhanced metagenomic taxonomic profiling"
  Journal: Nature Methods
  Year: 2015
  Volume: 12
  Number: 10
  Pages: 902–903
  DOI: 10.1038/nmeth.3589
  PMID: 26418763
  URL: http://www.nature.com/nmeth/journal/v12/n10/full/nmeth.3589.html
