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Markowitz, M., Saag, M., Powderly, W. G., Hurley, A. M., Hsu, A., Valdes, J. M., … Ho, D. D. (1995). A Preliminary Study of Ritonavir, an Inhibitor of HIV-1 Protease, to Treat HIV-1 Infection. New England Journal of Medicine, 333(23), 1534–1540. doi:10.1056/nejm199512073332204 
10.1056/NEJM199512073332204