Validation of the Ontario Protocol Assessment Level (OPAL) Tool for Assessing Clinical Trial Complexity and Supporting Workforce Planning in the Italian Clinical Research Context. - Napolitano D; Bozzetti M; Caruso R; Guberti M; Frau I; Smuck B; Fiorino G; Scaldaferri F; Laterza L; Gasbarrini A; Mora V (Therapeutic innovation & regulatory science, 2026)