https://software.broadinstitute.org/gatk/documentation/article.php?id=6472
http://www.bioinformatics.babraham.ac.uk/projects/fastqc/Help/3%20Analysis%20Modules/
https://gatkforums.broadinstitute.org/gatk/discussion/1247/what-should-i-use-as-known-variantssites-for-running-tool-x
https://software.broadinstitute.org/gatk/documentation/article?id=9183#4