1. Department of Medicine; University of Minnesota; Minneapolis Minnesota
2. Division of Epidemiology & Community Health; University of Minnesota; Minneapolis Minnesota
3. Center for Chronic Disease Outcomes Research; Minneapolis Veterans Affairs Health Care System; Minneapolis Minnesota
4. Department of Nephrology; Minneapolis Veterans Affairs Health Care System; Minneapolis Minnesota
5. Bone and Mineral Unit; Oregon Health & Science University; Portland Oregon
6. California Pacific Medical Center Research Institute; San Francisco California