Issues related to the research on vitamin K supplementation and bone mineral density.

Address: Department of Obstetrics and Gynecology, Columbia University Irving Medical Center, New York, NY, USA.; Department of Epidemiology, Columbia University Irving Medical Center, New York, NY, USA.; Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA, USA.; Department of Biostatistics, University of Alabama at Birmingham, Birmingham, AL, USA.; Department of Obstetrics and Gynecology, Columbia University Irving Medical Center, New York, NY, USA.; Department of Obstetrics and Gynecology, Columbia University Irving Medical Center, New York, NY, USA. [email protected].; Department of Epidemiology, Columbia University Irving Medical Center, New York, NY, USA. [email protected].