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https://chibe.upenn.edu/publications/comparison-of-web-based-and-paper-advance-directives-a-pilot-randomized-clinical-trial/ Comparison of Web-Based and Paper Advance Directives: A Pilot Randomized Clinical Trial - Center... randomized clinical trialweb basedadvance directivescomparisonpaper https://www.psoriasis-netz.de/adressen/studienzentren/clinical-trial-center-north/ Clinical Trial Center North - Studienzentren - Psoriasis-Netz clinical trial centernorthstudienzentrenpsoriasisnetz https://drs.ior.it/index.php/ricerca-e-innovazione/clinical-trial-center Clinical Trial Center (CTC) | ior clinical trial centerctcior