The HLA-DQβ1 insertion is a strong achalasia risk factor and displays a geospatial north-south gradient among Europeans.
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Eur J Hum Genet. 2016 Aug;24(8):1228-31. doi: 10.1038/ejhg.2015.262. Epub 2016 Jan 6.
Eur J Hum Genet. 2016.
PMID: 26733285
Free PMC article.