Current Status and Influencing Factors of Loss to Follow-up among Chronic Periodontitis Patients with Long-term Periodontal Therapy　
YANG Haijing，WANG Yonglan，ZHANG Yan，WANG Chunmei
Chinese General Practice . 2018, (30): 3693 -3699 .  DOI: 10.12114/j.issn.1007-9572.2018.00.036

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