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Retraction Note: Optical medical equipment application and observing the occurrence of hypotension in elderly patients after general anesthesia induction through arteriovenous ultrasound parameters

Crossref DOI link: https://doi.org/10.1007/s11082-024-07671-2

Published Online: 2024-10-09

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

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