Kyung-ann Lee; Seung-hwan Jung; Jong-sun Kim; Hyun-sook Kim. 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 2023, 38, 477-479.