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Background
Port wine birthmark (PWB) is a congenital vascular malformation of the skin. Pulsed dye laser (PDL) is the “gold standard” for the treatment of PWB globally. Hematoporphyrin monomethyl ether (HMME or hemoporfin)‐mediated photodynamic therapy (HMME–PDT) has emerged as the first choice for PWB treatment, particularly for young children, in many major hospitals in China during the past several...
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