Bogdanova, Simona, Tanya Shivacheva, Tsvetoslav Georgiev, and Petar Petrov. “Pain in COVID-19 and Features of Pathogenetic Molecular Mechanisms”. Rheumatology (Bulgaria) 30, no. 4 (March 6, 2023): 28–33. Accessed October 5, 2026. https://rheumatologybg.org/journal/rbj/article/view/104.