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Estimated equivalency of vitamin D production from natural ..:

Terushkin, Vitaly ; Bender, Anna ; Psaty, Estee L....
Journal of the American Academy of Dermatology.  62 (2010)  6 - p. 929.e1-929.e9 , 2010
Link: https://doi.org/10.1016/j.jaad.2009.07.028