Reference:
  Author: Petr Danecek and Adam Auton and Goncalo Abecasis and Cornelis A. Albers and Eric Banks and Mark A. DePristo and Robert E. Handsaker and Gerton Lunter and Gabor T. Marth and Stephen T. Sherry and Gilean McVean and Richard Durbin
  Title: The variant call format and VCFtools
  Journal: Bioinformatics
  Year: 2011
  Volume: 27
  Number: 15
  Pages: 2156-8
  DOI: 10.1093/bioinformatics/btr330
  PMID: 21653522
  URL: http://bioinformatics.oxfordjournals.org/content/early/2011/06/07/bioinformatics.btr330
  eprint: http://bioinformatics.oxfordjournals.org/content/early/2011/06/07/bioinformatics.btr330.full.pdf+html
