Okafor, C. N., Cook, R. L., Chen, X., Surkan, P. J., Becker, J. T., Shoptaw, S., . . . Plankey, M. W. (2017). Trajectories of Marijuana Use among HIV-seropositive and HIV-Seronegative MSM in the Multicenter AIDS Cohort Study (MACS), 1984–2013. AIDS Behav.

Okafor, Chukwuemeka N., Robert L. Cook, Xinguang Chen, Pamela J. Surkan, James T. Becker, Steve Shoptaw, Eileen Martin, und Michael W. Plankey. "Trajectories of Marijuana Use Among HIV-seropositive and HIV-Seronegative MSM in the Multicenter AIDS Cohort Study (MACS), 1984–2013." AIDS Behav 2017.

Okafor, Chukwuemeka N., et al. "Trajectories of Marijuana Use Among HIV-seropositive and HIV-Seronegative MSM in the Multicenter AIDS Cohort Study (MACS), 1984–2013." AIDS Behav 2017.