1. HIV and STD Unit, Infectious Diseases Service, Bellvitge University Hospital, Bellvitge Biomedical Research Institute, Hospitalet de Llobregat, Spain.
2. Hospital Universitari Germans Trias i Pujol, Badalona, Spain.
3. Universitat Autònoma de Barcelona, Barcelona, Spain.
4. Infectious Diseases Unit, Hospital SAS, Jerez de la Frontera, Spain.
5. Infectious Diseases Department, Hospital del Mar, Barcelona, Spain.
6. Internal Medice Services, Hospital Universitario La Paz–IdiPAZ, Madrid, Spain.
7. Infectious Diseases Unit, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.
8. Clinical Biostatistics Unit, Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain.
9. Hospital Reina Sofía-IMIBIC, Córdoba, Spain.
10. Hospital Ramón y Cajal-IRYCIS, Madrid, Spain.