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is subject to confounding by hospital (treatment highly dependent on the hospital, different SOC/ICU transfer practices, not included in PS), immortal time (only partly addressed in sensitivity analysis), co-treatment differences, calendar-time (SOC evolved rapidly early in the pandemic), binary coding for age (age 65 despite steep age-risk gradient), residual imbalance (variables dropped from PS), a composite outcome dependent on hospital triage/capacity, and other factors

Koushki M, Amiri-Dashatan N, Ahmadi N, Abbaszadeh H, Rezaei-Tavirani M

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doi: 10.1038/s41467-021-24859-2 17 AlborziniaHFlrezAFKrethSBrcknerLMYildizUGartlgruberMet al

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