Renal Insufficiency, Chronic

• MEDIZINISCHE UNIVERSITAT- Internal Medicine/Nephrology/Geriatric Department — Graz, Austria
• FRIEDRICH-ALEXANDER-UNIVERSITAT-Institute for Biomedicine of Aging — Erlangen, Germany
• BEN-GURION UNIVERSITY-Geriatrics Department — Beersheba, Israel
• INRCA Research Hospital — Ancona, Italy

• Niigata University Graduate School of Medicine — Niigata, Japan

• University Medical Center Goettingen — Göttingen, Germany

• Research Site — Los Angeles, California, United States
• Research Site — San Francisco, California, United States
• Research Site — Louisville, Kentucky, United States
• Research Site — Kansas City, Missouri, United States

• Uhmontpellier — Montpellier, France

• Creekside Endocrine Associates PC — Denver, Colorado, United States

• Hospital Clinico Universidad de Chile — Santiago, Chile

Not specified

• Baltimore VA Medical Center — Baltimore, Maryland, United States

• Childen's Healthcare of Atlanta — Atlanta, Georgia, United States