Fig. 1From: Antibodies against citrullinated proteins in relation to periodontitis with or without rheumatoid arthritis: a cross-sectional studyStudy flow chart showing the summary of the study design. RA, rheumatoid arthritis; Pd, periodontitis; RAPd group, subjects with RA and Pd; RA group, subjects with RA but without Pd; Pd group, subjects without RA but has Pd; HC group, subjects without both RA and Pd; UM, University of Malaya; UMMC, University of Malaya Medical Centre; BPE, basic periodontal examination; ELISA, enzyme link immunosorbent assayBack to article page