Bolyarova-Konova, Theodora, Lyubomir Stefanov, Zlatimir Kolarov, Radoslava Grozdanova, and Maria Nikolova. 2022. “Anti-Cyclic Citrullinated Peptide Antibody and Rheumatoid Factor and the Relationship Between Periodontitis and Rheumatoid Arthritis”. Proceedings of the Bulgarian Academy of Sciences 75 (3). Sofia, Bulgaria:451-57. https://doi.org/10.7546/CRABS.2022.03.16.