Investigating the impact of acceptance and commitment therapy for mental healthcare professionals: the effect on patients´ self-stigmatization, a pilot study - Helmus, Kim L.; van Doorn, Marilon; de Koning, Mariken B.; Myin-Germeys, Inez; Schirmbeck, Frederike N.; van Amelsvoort, Therese A. M. J.; Nieman, Dorien H.; Jaspers, Monique W. M.; Popma, Arne; de Haan, Lieuwe (Frontiers in Psychiatry, 2025)