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 [Internet]. 2023 Sep. 30 [cited 2025 Oct. 3];38(3):477-9. Available from: http://anadolupsikiyatri.net/index.php/pub/article/view/1364