PMC:7146663 / 1841-1992 JSONTXT

{"project":"LitCovid-PMC-OGER-BB","denotations":[{"id":"T32","span":{"begin":52,"end":55},"obj":"UBERON:0001232"},{"id":"T33","span":{"begin":56,"end":61},"obj":"UBERON:0000058"},{"id":"T34","span":{"begin":85,"end":90},"obj":"NCBITaxon:10239"}],"text":"re there these differences among regions?” There are no answers to these questions, but we offer the following speculations (Figure).\n\nWhy Have There B"}