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2. Levulan® Kerastick® Prescribing Information, DUSA Pharmaceuticals, Inc.® November 2005.

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5. Nakaseko H, Kobayashi M, Akita Y, et al. Histological changes and involvement of apoptosis after photodynamic therapy for actinic keratoses. Br J Dermatol. 003;148:122-127.

6. Data on file, DUSA Pharmaceuticals, Inc.®

7. Piacquadio DJ, et al. Photodynamic therapy with aminolevulinic acid topical solution and visible blue light in the treatment of multiple actinic keratoses of the face and scalp. Arch Dermatol. 2004;140:41-46.

8. Tschen EH, et al. Photodynamic therapy using aminolaevulinic acid for patients with nonhyperkeratotic actinic keratoses of the face and scalp: phase IV multicentre clinical trial with 12-month follow up. Brit J of Dermatol. 2006; 155:1262-1269.

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