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. 2023 Jun 27;13(13):2183. doi: 10.3390/diagnostics13132183

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Flow chart of patient enrollment and data preprocessing. BRPC: borderline resectable pancreatic cancer; LAPC: locally advanced pancreatic cancer; NACT: neoadjuvant chemotherapy; S-1: tegafur, gimeracil and oteracil potassium; US: ultrasound; CEUS: contrast-enhanced ultrasound; ROI: region of interest.