Published on in Vol 15, No 1 (2013): January
1 Department of Medicine, The University of North Carolina at Chapel Hill , Chapel Hill, NC, US
2 Center for Health Policy and Inequalities Research, Duke University , Durham, NC, US
Published on in Vol 15, No 1 (2013): January
1 Department of Medicine, The University of North Carolina at Chapel Hill , Chapel Hill, NC, US
2 Center for Health Policy and Inequalities Research, Duke University , Durham, NC, US