1University of Michigan School of Medicine, Ann Arbor, Michigan

2Veterans Administration, Veterans Affairs Medical Center, Ann Arbor, Michigan

3Dow Division of Health Services Research, Department of Urology, University of Michigan, Ann Arbor, Michigan

4Department of Urology, Vanderbilt University Medical Center, Nashville, Tennessee

5Division of Nephrology, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan

6Department of Urology, NorthShore University Health System, Evanston, Illinois

Correspondence: Dr. Vahakn B. Shahinian, University of Michigan – North Campus Research Complex Building 16, Room 110E 2800 Plymouth Road, Ann Arbor, MI 48109. Email: [email protected]

See related editorial, “The Clinical Study of Kidney Stone Disease and the Value of Specificity,” on pages 551–553.