Ketamine, a new (or old) kid on the block: A comprehensive three-year spatio-temporal study in Belgium through wastewater-based epidemiology, Natan, Van Wichelen, Boogaerts Tim, Maarten Quireyns, Rania Dermitzaki, Delputte Peter, Ul Hudda, Noor, Naomi De Roeck, Verhaegen Bavo, Van Hoorde Koenraad, Maloux Hadrien, et al. , Water Research, Jan-05-2025, Volume 276, (2025)