A. I. Anwar, R. R. Ruray, A. Adriani, K. Djawad, J. K. Wijaya, and A. A. Anwar, “Increased Vitamin A Level is associated with Clinical Improvement in Mild Acne Vulgaris: A Pre-test and Post-test Clinical Trial”, Open Access Maced J Med Sci, vol. 10, no. B, pp. 1932–1935, Jul. 2022.