"This is not one of our usual hour-long live discussions. Rather, this is an online question-and-answer session. Your questions and Dr. Vieth's answers will appear at the bottom of this page after 1 p.m. EDT today."
Professor Departments of Nutritional Sciences, Laboratory Medicine, and Pathobiology, Bone and Mineral Laboratory, Pathology and Laboratory Medicine,
University of Toronto, Toronto, Canada M5S 3E2
Mount Sinai Hospital, 600 University Avenue, Toronto, Ontario, Canada