Incorporating Patient-Reported Outcome Measures and Patient-Reported Experience Measures in Addiction Treatment Services in Belgium: Naturalistic, Longitudinal, Multicenter Cohort Study., Amine, Zerrouk, Charlotte Migchels, Clara De Ruysscher, Fernandez Kim, Antoine Jérôme, Florian De Meyer, Frieda Matthys, Wim van den Brink, Lina Crunelle, Cleo, and Wouter Vanderplasschen , JMIR Form Res, 2025 Apr 30, Volume 9, (2025)