In a study published online in the Proceedings of the National Academy of Sciences, Till Barnighausen, David Bloom, and Salal Humair of the Harvard School of Public Health examine "whether [HIV treatment as prevention (TasP)] is indeed a game changer or if comparable benefits are obtainable at similar or lower cost by increasing coverage of medical male circumcision (MMC) and antiretroviral treatment (ART)." They write, "The most cost-effective HIV prevention strategy is to expand MMC coverage and then scale up ART, but the most cost-effective HIV-mortality reduction strategy is to scale up MMC and ART jointly. TasP is cost effective by commonly used absolute benchmarks but it is far less cost effective than MMC and ART" (12/6).