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A sampling survey of gingival bleeding and dental calculus in Guangdong Province (2015-2016)
Weihua FAN, Jianbo LI, Wanghong ZHAO, Ziqiang LIU, Shaohong HUANG
Journal of Prevention and Treatment for Stomatological Diseases . 2018, (3): 151 -157 .  DOI: 10.12016/j.issn.2096-1456.2018.03.003