Validity evidence for endoscopic ultrasound competency assessment tools: Systematic review by Alessandra Ceccacci, Harneet Hothi, Rishad Khan, Nikko Gimpaya, Brian P.H. Chan, Nauzer Forbes, Paul James, Daniel Jeffry Low, Jeffrey Mosko, Elaine T. Yeung, Catharine M Walsh, Samir C Grover

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