Effectiveness of an add-on guided internet-based emotion regulation training (E-TRAIN) in adolescents with depressive and/or anxiety disorders: study protocol for a multicenter ran... oleh Julie Emmelkamp, Marike A Wisman, Nico JM Beuk, Yvonne AJ Stikkelbroek, Maaike H Nauta, Jack JM Dekker, Carolien Christ