1. 1. World Health Organization. Sun protection. Available at: http://www.who.int/uv/sun_protection/en (Assessed 3 December 2007).
2. 2. U.S. Food and Drug Administration, Department of Health and Human Services, FDA, USA. Sunscreen drug product for over-the-counter human use, final monograph. Federal Register, Vol. 64, No. 98; 27689-27693, 1999.
3. 3. CTFA SA, COLIPA, JCIA, CTFA-USA. International Sun Protector Factor Test Method, May 2006
4. 4. Stokes R , Diffey BL. How well are sunscreen users protected? Photodermatol Photoimmunol Photomed 1997; 13: 186-188.
5. 5. Stenberg C , Larko O. Sunscreen application and its importance for the sun protection factor. Arch Dermatol 1985; 121: 1400-1402.