aHospital Clinic, Barcelona, SpainbBC Centre for Excellence in HIV/AIDS, St Paul's Hospital, Vancouver, CanadacEmory University School of Medicine, Atlanta, Georgia, USAdTor Vergata University, Rome, ItalyeHospital Civil de Guadalajara, University of Guadalajara, MexicofDivision of Infectious Diseases, Department of Medicine, Stanford UniversitygGilead Sciences, Inc., Foster City, California, USAhIrsiCaixa Foundation, Hospital Universitari Germans Trias I Pujol, Universitat Autonoma Barcelona, SpainiAntiviral Drug Monitoring Unit, INMI L Spallanzani, Rome, Italy.