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Figure 2.

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Study enrollment and outcomes. CMS = Centers for Medicare and Medicaid Services; HPSA = health professionals shortage area; MUA = medically underserved area. Lost to follow-up refers to randomized subjects who did not complete the follow-up examination. Dropped out refers to subjects who communicated that they wished to drop out of the study at some time during the follow-up period; some of these subjects returned for the follow-up examination. Completers refers to randomized subjects who did not drop out; some of these subjects did not return for the follow-up examination.

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