Collaborative update of a rule-based expert system for HIV-1 genotypic resistance test interpretation by Paredes, R, Tzou, PL, Van Zyl, G, Barrow, G, Camacho, R, Carmona, S, Grant, PM, Gupta, RK, Hamers, RL, Harrigan, PR, Jordan, MR, Kantor, R, Katzenstein, DA, Kuritzkes, DR, Maldarelli, F, Otelea, D, Wallis, CL, Schapiro, JM, Shafer, RW