Why Group Therapy Works and How to Do It - Christer Sandahl; Catharina Asklin-Westerdahl; Mats Bj(3y(Brling; Anna Malmquist Saracino; Lena Wennlund; Ann $1!"(Brhammar; Hj(3y(Brdis Nilsson Ahlin; Ulf ?kerstr(3y(Bm s (Taylor and Francis, 2021)