Roger Bouillon1, Mark Haussler2, Dan Bikle3, Sylvia Christakos4, JoEllen Welsh5. 1. KU Leuven Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases, Metabolism and Ageing Herestraat Leuven VB 3000 Belgium. 2. University of Arizona College of Medicine-Phoenix, Ringgold Standard Institution-Basic Medical Sciences Phoenix AZ USA. 3. University of California San Francisco Ringgold Standard Institution-Medicine San Francisco CA USA. 4. Department of Microbiology, Biochemistry and Molecular Genetics Rutgers University Newark NJ USA. 5. State University of New York at Albany, Ringgold Standard Institution-Environmental Health Sciences Albany NY USA.