“…This qualitative study was conducted on the basis of a multicentre, randomized and controlled trial (RCT) on the clinical (cost) effectiveness of individual ST with six personality disorders: avoidant, dependent, obsessive-compulsive, paranoid, histrionic and/or narcissistic personality disorder (Bamelis, Evers and Arntz, 2012;Bamelis et al, 2014Bamelis et al, , 2015. Approval was granted by the medical ethics committee of Maastricht University.…”