1. Amirlak B, Shahabi L, Javaheri S, Talavera F, Stadelmann WK et al (2011) Skin anatomy. In: Caputy G (ed).
www.emedicinemedscapecom/article/1294744-overview
2. Goldsmith L (1991) Physiology, biochemistry and molecular biology of the skin. Oxford University Press, New York
3. Bikle DD, Pillai S (1993) Vitamin D, calcium, and epidermal differentiation. Endocr Rev 14:3–19
4. Yuspa S (1998) The pathogenesis of squamous cell cancer: lessons learned from studies of skin carcinogenesis. J Dermatol Sci 17:1–7
5. American Academy of Dermatology (2011) Dermatology A to Z: stats and facts. American Academy of Dermatology, San Diego, CA.
http://www.aad.org/dermatology-a-to-z