1 Department of Urology, Mayo Clinic, Rochester, MN.
2 Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN.
3 Department of Internal Medicine, Division of Nephrology and Hypertension, Mayo Clinic, Rochester, MN; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN.
4 Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN.