1. IOM (1997) Dietary reference intakes for calcium, phosphorus, magnesium, vitamin D, and Fluoride. http://www.nap.edu/catalog/5776.html
2. Lane NE (2006) Epidemiology, etiology, and diagnosis of osteoporosis. Amer J Obstetric Gynecol 194:S3–S11
3. U.S. Dept. of Health and Human Services (2004) Bone health and osteoporosis: A report of the Surgeon General Public Health Service, Office of the Surgeon General; Washington, D.C. http://www.surgeongeneral.gov/library/bonehealth/content.html assessed June 30, 2008
4. National Osteoporosis Foundation. http://www.nof.org/osteoporosis/diseasefacts.htm (assessed December 30, 2006)
5. Li N, Ou P, Zhu H et al (2001) Prevalence of primary osteoporosis in the middle aged and elderly population in parts of China. Chin J Orthop 21:275–277 [in Chinese]