Evaluating changes in functioning and psychological distress in visitors of the @ease youth mental health walk-in centres – ERRATUM - Anouk Boonstra; Therese A. M. J. van Amelsvoort; Rianne M. C. Klaassen; Arne Popma; Nina H. Grootendorst-van Mil; Wim Veling; Remco F. P. de Winter; Nynke Boonstra; Sophie M. J. Leijdesdorff (BJPsych Open, 2024)