Erratum {#Sec1}
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During the production of this article \[[@CR1]\], errors occurred in equations and algorithms. The Editorial Department of *BMC Bioinformatics* would like to apologise and inform its readers that an updated version is now available on the *BMC Bioinformatics* website.

The online version of the original article can be found under doi:10.1186/1471-2105-16-S13-S2.
