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. 2019 Sep 20;12(4):143. doi: 10.3390/ph12040143

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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From [8,9]. Left, minimum PpIX-effective light dose threshold of 8 J cm⁻² shown for patients with grade I AK lesions. Right, minimum PpIX-effective light dose threshold of 3.5 J cm⁻² shown for all grades of lesion.