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APA Citation
Pei, X., Ouyang, X., He, L., Cao, C., Luan, Q., & Suda, R. (n.d.). a 4-year prospective study of the progression of periodontal disease in a rural Chinese population. Journal of dentistry, 43(2), 192–200. http://access.bl.uk/ark:/81055/vdc_100025860543.0x000052