BMC complement. med. ther. BMC complement. med. ther. Effectiveness of an amygdala and insula retraining program combined with mindfulness training to improve the quality of life in patients with long COVID: a randomized controlled trial protocol Gasión Virginia Barceló-Soler Alberto Universidad de Zaragoza Beltrán-Ruiz María Universidad de Zaragoza Hijar-Aguinaga Rinchen Universidad de Zaragoza Camarero-Grados Loreto López-del-Hoyo Yolanda Universidad de Zaragoza García-Campayo Javier Universidad de Zaragoza Montero-Marin Jesus 2023 research-article