Head of Medicines Agency Clinical Trials Facilitation Group: Results of the Voluntary Harmonisation Procedure 2009 – 2019 https://www.hma.eu/fileadmin/dateien/Human_Medicines/01-About_HMA/Working_Groups/CTFG/2020_02_CTFG_Results_of_the_Voluntary_Harmonisation_Procedure_2009-2019.pdf