Yi-Ping Fang and Hsien-Ting Cheng, 5-Aminolevulinic Acid-Loaded Gel, Sponge Collagen to Enhance the Delivery Ability to Skin. journal = {International Journal of Biotechnology and Bioengineering}, [online]. World Academy of Science, Engineering and Technology. June 2012, vol. 66(6). 377 - 380 [viewed 20 September 2024]. Available from: https://publications.waset.org/pdf/7513.