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Reference 60 is a duplicate of reference 55. Thank you to Lars Juhl Jensen for noticing this error.
Please note there is an error in reference 55. The year of publication should be 2011. The complete correct reference is:
Rossin EJ, Lage K, Raychaudhuri S, Xavier RJ, Tatar D, et al. (2011) Proteins encoded in genomic regions associated with immune-mediated disease physically interact and suggest underlying biology. PLoS Genet 7: e1001273 doi:10.1371/journal.pgen.1001273.