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Fig 22 Apparent complete response of SCCs after photodynamic therapy. (1) “elevated” SCCs; (2) “early invasive” SCCs; (3) “nodular” SCCs; (4) “superficial” SCCs; (5) no glycolic acid added to photodynamic therapy; (6) photodynamic therapy plus glycolic acid; (7) “invasive” SCCs; (8) “microinvasive” SCCs
