From the Royal Free Centre for HIV Medicine, Department of Primary Care and Population Sciences, Royal Free and University College Medical School, London, aCity Hospital, Edinburgh, UK, the bEuroSIDA Coordinating Centre, Hvidovre Hospital, Hvidovre, Denmark, cKarolinska Hospital, Stockholm, Sweden, the dMedical College of Saint Bartholomew's Hospital, London, UK, eHospital Santa Maria, Lisbon, Portugal, fCentre Hospitalier Universitaire Vaudois, Lausanne, Switzerland, and gOspedale L. Sacco, Milan, Italy. *See Appendix.