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Letter to the editor regarding ‘clinical characteristics and factors associated with in-hospital post-surgical mortality in COVID-19 patients at a tertiary care center in Karachi, Pakistan

Crossref DOI link: https://doi.org/10.1186/s12879-026-13912-4

Published Online: 2026-07-06

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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