Reference:
1. Langner MD, Maibach HI. Many common drugs in dermatology are light, temperature or moisture-sensitive. Available from http://www.medscape.com/viewarticle/588826_3
2. Karpinski JP. Medication expiration dating. PharmacyTech News. 2011. Available from https://www.cedrugstorenews.com/userapp/lessons/page_view_ui.cfm?lessonuid=&pageid=98A4D0865060D9CDE96A50282801AE4D
3. http://www.usp.org/pdf/EN/referenceStandards/msds/1012065.pdf
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