School of Nursing, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. Health Science Library, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. School of Medicine, Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. Undergraduate Program, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. School of Public Health, Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.