Reference:
http://www.medicinenet.com/methyl_salicylate_and_menthol-topical/article.htm
Roth SH, Shainhouse JZ. Efficacy and Safety of a Topical Diclofenac Solution (Pennsaid) in the Treatment of Primary Osteoarthritis of the Knee. Arch Intern Med. 2004;164:2017-2023
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