Fig 1 Flow chart of HIV Defaults Study. Of 5801 patients approached for inclusion in study, 4800 consented. Of those approached, 33.5%, 34.7%, and 31.8% were assigned to opt-in, active choice, and opt-out test treatments, respectively. The final study population comprised 33.5% opt-in, 33.9% active-choice, and 32.6% opt-out patients