Díaz-García, A. González-Robles, A. García-Palacios, A. Fernández-Álvarez, J. Castilla, D. Bretón, J.M. Baños, R.M. Quero, S. Botella, C. Negative and positive affect regulation in a transdiagnostic internet-based protocol for emotional disorders: Randomized controlled trial JMIR, J. med. internet res. 10.2196/21335 2021 2021