PMC:7095437 / 29131-29971 JSONTXT

{"project":"LitCovid-PD-CLO","denotations":[{"id":"T223","span":{"begin":185,"end":186},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"}],"text":"Publisher’s note\nSpringer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.\n\nFunding information\nThis study was supported by a grant from the Natural Science Foundation of China (81401382).\n\nCompliance with ethical standards\n\nGuarantor\nThe scientific guarantor of this publication is Wenbing Zeng.\n\nConflict of interest\nThe authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.\n\nStatistics and biometry\nNo complex statistical methods were necessary for this paper.\n\nInformed consent\nWritten informed consent was waived by the Institutional Review Board.\n\nEthical approval\nInstitutional Review Board approval was obtained.\n\nMethodology\n•Retrospective\n•Observational\n•Multicenter study"}

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