**About the Editors**

**Marie Courbebaisse**, MD, Ph.D., is a nephrologist who specializes in renal physiology and mineral metabolism. She is involved in clinical trials investigating the effects of vitamin D on skeletal and extra –skeletal health, such as the VITALE study (VITamine D Supplementation in RenAL Transplant Recipients) and the FEDEP study (Vitamin D and Preeclampsia).

**Etienne Cavalier**, Ph.D. and European Specialist of Laboratory Medicine (EuSpLM), is Professor of Clinical Chemistry at the University of Liege and Head of the Department of Clinical Chemistry ` at the CHU of Liege. He is the current President of the Royal Belgian Society of Laboratory Medicine ` and the Chairman of the IFCC-IOF Committee for bone markers. He is also a member of the Board of the European Society for Clinical and Economic Aspects of Osteoporosis, Osteoarthritis and Muskuloskeletal Diseases (ESCEO) and member of the Belgian Bone Club. He is a member of the scientific advisory board of the International Osteoporosis Foundation (IOF) and ESCEO, as well as a member of various societies of Clinical Chemistry, Nephrology and Endocrinology. Professor Cavalier has published more than 300 scientific papers in peer-reviewed journals indexed in Pubmed and has written 8 books or chapters.
