Knowledge/attitude/practices of HPV & cervical cancer, willingness to participate in vaccine trial in preparation for HIV & HPV vaccine trials in Mali by Poole D, Tracy K, Levitz L, Yekta S, Kossow E, Huang T, Rochas M, Sangare K, Tounkara K, Aboubacar B, Koita O, Diallo F, Sow S, Téguété I, Dolo A, Bougoudogo F, Lurie M, De Groot AS