DOI: 10.1055/s-00000025

Hormone and Metabolic Research

References

Engelsen O, Brustad M, Aksnes L, Lund E.
Daily duration of vitamin D synthesis in human skin with relation to latitude, total ozone, altitude, ground cover, aerosols and cloud thickness. 
Photochem Photobiol 2005; 81: 1287-1290  

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