1. Division of Nephrology and Hypertension; Mayo Clinic; Rochester Minnesota
2. Department of Nephrology; the First Hospital Affiliated to Jinan University; Guangzhou 510630 China
3. Division of Health Sciences Research & Biomedical Statistics and Informatics; Mayo Clinic; Rochester Minnesota
4. Division of Cardiovascular Diseases; Mayo Clinic; Rochester Minnesota
5. Division of Orthopedic Surgery; Mayo Clinic; Rochester Minnesota