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| Clinical Efficacy of Dot Matrix CO2 Laser Deep FX+Active FX Mode Combined with Compound Polymyxin B Ointment in the Treatment of Concave Acne Scars |
| YAN Yun, DONG Xinmei, XIANG Shangwen |
| First-author's address: Dermatology, Macheng People's Hospital, Macheng 438300, China |
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