Baseline natural killer and T cell populations correlation with virologic outcome after regimen simplification to atazanavir/ritonavir alone (ACTG 5201). oleh John E McKinnon, Robbie B Mailliard, Susan Swindells, Timothy J Wilkin, Luann Borowski, Jillian M Roper, Barbara Bastow, Mary Kearney, Ann Wiegand, John W Mellors, Charles R Rinaldo, A5201 study team