1. Department of Psychology, Faculty of Biomedical and Health Sciences, Universidad Europea de Madrid, Villaviciosa de Odón, Spain
2. Fundación Aladina, Hospital Universitario Infantil “Niño Jesús”, Madrid, Spain
3. Fundació Hospital de Sant Jaume I Santa Magdalena, Mataró, Spain
4. Department of Psychology, University of Memphis, Memphis, TN, USA
5. Portland Institute for Loss and Transition, Portland, OR, USA
6. Department of Clinical Psychology and Psychotherapy, University of Trier, Trier, Germany