1 Vanderbilt O'Brien Kidney Center, Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
2 Division of Epidemiology, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
3 Department of Exercise Science and Athletic Training, Springfield College, Springfield, Massachusetts, USA.
4 Kidney Research Institute, Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington, USA.
5 Providence Medical Research Center, Providence Health Care, Spokane, Washington, USA.
6 Department of Nephrology, Bay State Medical Center, Springfield, Massachusetts, USA.
7 Department of Biostatistics, Vanderbilt University Medical Center, Nashville, Tennessee, USA.