[1] VA Pittsburgh Healthcare Syst, Renal Sect, Pittsburgh, PA 15240 USA
[2] Univ Pittsburgh, Sch Med, Dept Med, Renal Electrolyte Div, Pittsburgh, PA 15213 USA
[3] Univ Calif San Francisco, Dept Med, Div Nephrol, San Francisco, CA USA
[4] Univ Iowa, Dept Pediat, Carver Coll Med, Div Nephrol, Iowa City, IA 52242 USA
[5] George Washington Univ, Dept Anesthesiol & Crit Care Med, Washington, DC USA
[6] George Washington Univ, Dept Med, Div Renal Dis & Hypertens, Washington, DC USA
[7] VA Connecticut Healthcare Syst, Renal Sect, West Haven, CT USA
[8] Yale Univ, Sch Med, Dept Med, Nephrol Sect, New Haven, CT 06510 USA
[9] Cincinnati VA Med Ctr, Renal Sect, Cincinnati, OH USA
[10] Univ Cincinnati, Dept Internal Med, Div Nephrol & Hypertens, Cincinnati, OH USA
[11] Univ Alabama Birmingham, Dept Med, Div Nephrol, Birmingham, AL 35294 USA
[12] Brigham & Womens Hosp, Dept Med, Div Renal, Boston, MA 02115 USA