“Why Are Melanoma Survivors Found to be at Increased Risk of Other Cancers?”; www.drbriffa.com/2010/0318/why-are-melanoma-survivors-found-to-be-at-increased-risk-of-other-cancers/

www.sleepfoundation.org/article/sleep-topics/melatonin-and-sleep

“Friluftsliv: The Scandinavian Philosophy of Outdoor Life”; http://jee.lakeheadu.ca/index.php/cjee/article/viewFile/302/222

“Traditionally Living Populations in East Africa Have a Mean Serum 25-Hydroxyvitamin D Concentration of 115 nmol/l”; http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8478473

“Aging, Muscle Fiber Type, and Contractile Function in Sprint-Trained Athletes”; http://jap.physiology.org/content/101/3/906.full