| http://www.w3.org/ns/prov#value | - The target region may be affected by a disease or ailment such as Barrett's Esophagus and may additionally contain a photosensitizing agent or precursor such as that described in U.S. Pat. Nos. 5,955,490, 5,422,093, 5,234,940, 5,211,938, 5,097,262 and in James C. Kennedy et al., Photodynamic Therapy (PDT) and Photodiagnosis (PD) Using Endogenous Photosensitization Induced by 5-Aminolevulinic Acid
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