Phonophoresis versus topical application of ketoprofen: comparison between tissue and plasma levels.
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Cagnie B, Vinck E, Rimbaut S, Vanderstraeten G.
Phys Ther. 2003 Aug;83(8):707-12.
Comment in: Phys Ther. 2003 Dec;83(12):1128-9; author reply 1129.