Kyung-ann Lee, Seung-hwan Jung, Jong-sun Kim, and Hyun-sook Kim. 2023. “Comparison of the Efficacy and Safety of Oligomeric Proanthocyanidins and Nifedipine in Patients With Primary Raynaud’s Phenomenon: An Open-Label, Randomized, Prospective Pilot Study”. Archives of Rheumatology 38 (3):477-79. https://doi.org/10.46497/ArchRheumatol.2023.9212.