O. Schünemann, A. Jansen, U. Willutzki, and N. Heinrichs, “Allegiance and Treatment Quality as Moderators of the Comparative Effectiveness of Psychotherapy? A Systematic Review and Meta-Analysis of Studies Comparing Humanistic Psychotherapy to Other Psychotherapy Approaches”, Clin Psychol Eur, vol. 7, no. 1, p. Article e9709, Feb. 2025.