1. HIV Unit, Internal Medicine Service, Hospital Universitario La Paz, IdiPAZ, Madrid, Spain
2. Biological and Health Psychology Department, Universidad Autónoma de Madrid, Madrid, Spain
3. Psychology and Sociology Department, Universidad de Zaragoza, Teruel, Spain
4. Instituto de Investigación Sanitaria de Aragón, Zaragoza, Spain
5. Basic, Clinic and Psychobiology Department, Universitat Jaume I de Castelló, Castellón, Spain