Baseline HbA1c Level Influences the Effect of Periodontal Therapy on Glycemic Control in People with Type 2 Diabetes and Periodontitis: A Systematic Review on Randomized Controlled Trails. - Chen, Ya-fei; Zhan, Qi; Wu, Chen-zhou; Yuan, Yi-hang; Chen, Wen; Yu, Fan-yuan; Li, Yi; Li, Long-jiang (Diabetes Therapy, 2021)