1. Vitamin D deficiency is associated with anxiety and depression in fibromyalgia;Armstrong;Clinical Rheumatology,2006
2. Vitamin D deficiency may play a role in depression;Berk;Medical Hypotheses,2007
3. The saddest season;Gaines;Minnesota Medicine,2005
4. The UV advantage;Holick,2003
5. The Tromso study;Jorde;Journal of Neurology,2005