1. Elders, P.J. et al. J. Bone Miner. Res. 1994 July;9(7):963-970.
2. Devine, A. et al. Osteoporos. Int. 1997;7(1):23-28.
3. Nordin, B.E. Osteoporos. Int. 2009; Dec 20(12):2135-2143.
4. Weaver, C.M. et al. Osteoporos Int. 2016 Jan;27(1):367-76. (meta-analysis)