Testing the combination of Feeling Safe and peer counselling against formulation-based cognitive behaviour therapy to promote psychological wellbeing in people with persecutory del... by Tolmeijer, E, Waite, F, Isham, L, Bringmann, L, Timmers, R, van den Berg, A, Schuurmans, H, Staring, ABPT, de Bont, P, van Grunsven, R, Stulp, G, Wijnen, B, van der Gaag, M, Freeman, D, van den Berg, D