References:
1 - http://www.aad.org/public/publications/pamphlets/sun_squamous.html
2 - Robinson JK. Sun Exposure, Sun Protection, and Vitamin D.
JAMA 2005; 294:
1541-43.
3 - Freedberg, et. al.
(2003). Fitzpatrick's Dermatology in General Medicine. (6th ed.).
McGraw-Hill. ISBN 0071380760
4 - http://en.wikipedia.org/wiki/Signet_ring_cell_carcinoma
5 - http://medical-dictionary.thefreedictionary.com/signet-ring+cell+carcinoma
6 - http://www.teteamodeler.com/sante/soleil/vichy/peau1.htm
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