Reference:
1. Michaelsson G, Juhlin L, Vahlquist A. Effects of oral zinc and vitamin A in acne. Arch Dermatol 1977;113: 31–36.
2. Nast A, et al. European evidence-based (S3) guidelines for the treatment of acne. J Eur Acad Dermatol Venereol 2012; 26(Suppl. 1), 1–29.
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