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. Author manuscript; available in PMC: 2013 Nov 26.
Published in final edited form as: Stat Appl Genet Mol Biol. 2012 Nov 26;11(6):10.1515/1544-6115.1803 /j/sagmb.2012.11.issue-6/1544-6115.1803/1544-6115.1803.xml. doi: 10.1515/1544-6115.1803