Bibliographical noteFunding Information:
T. G. is a Wellcome Trust clinical research training fellow. C. M. has received funding to attend conferences from Astellas, Pfizer and Gilead and an educational grant from Pfizer. S. H. A. has served on UK Advisory Boards for Gilead and MSD and has received sponsorship to attend international meetings from Schering-Plough, Gilead and Wyeth. D. A. E. has received funding to attend conferences from MSD, Gilead and Astellas.