Reference:
 author: Li, Heng and Ruan, Jue and Durbin, Richard
 title: Mapping short DNA sequencing reads and calling variants using mapping quality scores
 journal: Genome Research
 volume: 18
 number: 11
 pages: 1851-1858
 doi: 10.1101/gr.078212.108
 PMID: 18714091
 year: 2008
 URL: http://genome.cshlp.org/content/18/11/1851.abstract
 eprint: http://genome.cshlp.org/content/18/11/1851.full.pdf+html
