1. Institute of Health Research of Aragon (IIS), 50009 Zaragoza, Spain
2. Navarra Medical Research Institute (IdiSNA), 31008 Pamplona, Spain
3. Research Network on Chronicity, Primary Care and Health Promotion (RICAPPS), 50009 Zaragoza, Spain
4. Department of Psychology and Sociology, University of Zaragoza, 50009 Zaragoza, Spain
5. Department of Psychiatry, University of Zaragoza, 50009 Zaragoza, Spain
6. CicPsi, Faculdade de Psicologia, Universidade de Lisboa, 1649-004 Lisbon, Portugal
7. Center for Mindfulness and Compassion, Cambridge Health Alliance, Cambridge, MA 02141, USA
8. Department of Family Medicine, Medical School, University of Massachusetts, Worcester, MA 01655, USA
9. Department of Basic, Developmental and Educational Psychology, 08193 Cerdanyola del Vallès, Spain