1. Nell Hodgson School of Nursing, Emory University, Atlanta, Georgia.
2. School of Nursing, University of Wisconsin-Madison, Madison, Wisconsin.
3. School of Public Health, Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
4. School of Nursing, Johns Hopkins University, Baltimore, Maryland.
5. School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
6. UNC Kidney Center, Chapel Hill, North Carolina.