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3. When should sunscreen be reapplied?;Diffey;J Am Acad Dermatol,2001
4. Global state of sunscreens;Osterwalder;Photodermatol Photoimmunol Photomed,2014
5. American Academy of Dermatology Sunscreen 101: Dermatologists Answer Burning Questions about Sunscreens http://www.aad.org/stories-and-news/news-releases/sunscreen-101-dermatologists-answer-burning-questions-about-sunscreens Schaumburg, IL American Academy of Dermatology 2013