Additional Information: The following researchers are part of the Royal Free Centre for HIV Medicine. Clinical: S. Bhagani, R. Breen, P. Byrne, A. Carroll, Z. Cuthbertson, A. Dunleavy, A. M. Geretti, B. Heelan, M. Johnson, S. Kinloch–de Loes, M. Lipman, S. Madge, N. Marshall, D. Nair, G. Nebbia, B. Prinz, S. Shah, L. Swader, M. Tyrer, and M. Youle. Data Management: C. Chaloner, H. Grabowska, J. Holloway, J. Puradiredja, D. Ransom, and R. Tsintas. Biostatistics/Epidemiology: W. Bannister, L. Bansi, A. Cozzi-Lepri, Z. Fox, E. Harris, T. Hill, F. Lampe, R. Lodwick, A. Mocroft, A. Phillips, C. Sabin, and C. Smith. Laboratory: E. Amoah, C. Booth, G. Clewley, A. Garcia Diaz, B. Gregory, G. Janossy, W. Labbett, and M. Thomas.