Challenges in Drug Surveillance: Strengthening the Analysis of New Psychoactive Substances by Harmonizing Drug Checking Services in Proficiency Testing., Balcaen, Margot, Ventura Mireia, Gil Cristina, Luf Anton, Martins Daniel, Cunha Mar, Tögel-Lins Karsten, Wolf Danny, Blanckaert Peter, and Deconinck Eric , Int J Environ Res Public Health, 2023 Mar 06, Volume 20, Issue 5, (2023)