| http://www.w3.org/ns/prov#value | - The present study examines the effects of bright light on the profiles of hormones known to be affected ... 324 Geomagnetic activity influences the melatonin secretion at latitude 70 degrees N. Weydahl A - - 2001 Factors other than light may affect variations in melatonin, including disturbances in the geomagnetic field.
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