Siddique, Ayesha, et al. “ASSOCIATION OF PERIODONTITIS AND RHEUMATOID ARTHRITIS BIOMARKER ANTI-CYCLIC CITRULLINATED PEPTIDES PROTEINS”. Pakistan Journal of Physiology, vol. 11, no. 1, Mar. 2015, pp. 10-12, doi:10.69656/pjp.v11i1.374.