DOI:
10.1055/s-00000025
Hormone and Metabolic Research
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References
Reusch J, Ackermann H, Badenhoop K.
Cyclic changes of vitamin D and PTH are primarily regulated by solar radiation: 5-year analysis of a German (50 degrees N) population.
Horm Metab Res 2009; 41: 402-407
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