1. Department of Medicine; Duke University; Durham North Carolina USA
2. Department of Medicine; Stanford University School of Medicine; Palo Alto California USA
3. Denver Nephrology; Denver Colorado USA
4. Nephrology and Mineral Metabolism; Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán; Mexico City District Federal Mexico
5. Amgen, Inc; Thousand Oaks California USA
6. Inserm Unit 1088; UFR Médecine/Pharmacie, Université de Picardie; Amiens France
7. Department of Nephrology; Universitätsklinikum der RWTH Aachen; Aachen Germany
8. University of Minnesota; Minneapolis Minnesota USA
9. Hôpital Manhès; Paris France
10. Indiana University School of Medicine and Roudebush Veterans Administration Medical Center; Indianapolis Indiana USA
11. Health Sciences Center; St. John's Newfoundland Canada
12. University College London; London United Kingdom