Prototypical Clinical Trial Registry Based on Fast Healthcare Interoperability Resources (FHIR): Design and Implementation Study - Gulden, Christian; Blasini, Romina; Nassirian, Azadeh; Stein, Alexandra; Altun, Fatma Betül; Kirchner, Melanie; Prokosch, Hans-Ulrich; Boeker, Martin (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2021)