Trials Trials, Vol 22, Iss 1, Pp 1-10 (2021) Mangset, M, Kitzmüller, G, Evju, A S, Angel, S, Aadal, L, Martinsen, R, Bronken, B A, Kvigne, K J, Bragstad, L K, Hjelle, E G, Sveen, U & Kirkevold, M 2021, ' Perceived study-induced influence on the control group in a randomized controlled trial evaluating a complex intervention to promote psychosocial well-being after stroke : a process evaluation ', Trials, vol. 22, 850 . https://doi.org/10.1186/s13063-021-05765-w