Specialised treatment based on cognitive behaviour therapy versus usual care for tinnitus: a randomised controlled trial - Cima, R F; Maes, I H; Joore, M A; Scheyen, D J; El Refaie, A; Baguley, D M; Anteunis, L J; van Breukelen, G J; Vlaeyen, J W (Lancet, 2012)