AIDS in Africa [2] (multiple letters)

David Gisselquist, John J. Potterat, Paul Epstein, Francois Vachon, Stephen F. Minkin, Anne Buvé, Mario Clerici, Adriano Boasso, Giuliano Rizzardini, Alaka Deshpande, Mara Biasin, Felix I.D. Konotey-Ahulu, Peter D. Ghys, Neff Walker, Catherine Hankins, Justin Parkhurst