[1] Mayo Clin, Dept Urol, Rochester, MN 55905 USA
[2] Mayo Clin, Dept Lab Med & Pathol, Rochester, MN USA
[3] Mayo Clin, Dept Hlth Sci Res, Rochester, MN USA
[4] Acad Sci Czech Republic, Inst Organ Chem & Biochem, Prague, Czech Republic
[5] Mayo Clin, Dept Immunol, Rochester, MN USA