Reference:
Bone Development and Structure [Online: http://www.nsbri.org/humanphysspace/focus6/ep_development.html] cited on September 3, 2013.
New Recommended Daily Amounts of Calcium and Vitamin D, NIH Medline Plus [Online: http://www.nlm.nih.gov/medlineplus/magazine/issues/winter11/articles/winter11pg12.html] cited on September 3, 2013.
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