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. Am J Trop Med Hyg. 2020 Aug;103(2):609-612. doi: 10.4269/ajtmh.20-0563. Epub 2020 Jun 9. Am J Trop Med Hyg. 2020. PMID: 32524964 Free PMC article.
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 - Gluten intolerance a significant risk factor
 - Infectious disease of the uterus
 - Absence of an individual specific disease