Kapadia, N. F., Khalid, G., Burhany, T., & Nakhoda, T. (2016). Comparative efficacy and safety and efficacy of systemic 13-cis retinoic acid 20mg/day vs. 40mg/day in acne vulgaris. Journal of Pakistan Association of Dermatologists, 15(3), 238–241. Retrieved from https://www.jpad.com.pk/index.php/jpad/article/view/650