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Comparative efficacy and safety and efficacy of systemic 13-cis retinoic acid 20mg/day vs. 40mg/day in acne vulgaris. J Pak Assoc Dermatol [Internet]. 2016 Dec. 28 [cited 2026 Jul. 27];15(3):238-41. Available from: https://www.jpad.com.pk/index.php/jpad/article/view/650