Original ResearchPublished 9 October 2026Therapeutic alliance and predictive validity of reflective functioning in conjoint mentalization-based treatment for borderline personality disorderDag Anders Ulvestad · Elfrida Hartveit Kvarstein · Andreas Ekberg · Peder Ludvig Sætre · Geir Pedersen · Theresa WilbergFrontiers in Psychologydoi 10.3389/fpsyg.2026.1919516