Microbicide Trials Network CLARIFICATION MEMO #02 TO: MTN-003 DAIDS Document ID #10622 Phase 2B Safety and Effectiveness Study of Tenofovir 1% Gel, Tenofovir Disoproxil Fumarate Tablet and Emtricitabine/Tenofovir Disoproxil Fumarate Tablet for the Prevention of HIV Infection in Women