A Cross-Sectional Study of Barriers to Personal Health Record Use among Patients Attending a Safety-Net Clinic - Hilton, JF; Barkoff, L; Chang, O; Halperin, L; Ratanawongsa, N; Sarkar, U; Leykin, Y; Munoz, RF; Thorn, DH; Kahn, JS (PLoS ONE, 2012)