Suwannagindra, Sukhumchawee, Boonyanit Thaweboon, and Varunee Kerdvongbundit. 2020. “Correlation Between Cell Free DNA in Gingival Crevicular Fluid and Clinical Periodontal Parameters by Using Two Collection Techniques”. Mahidol Dental Journal 40 (2). Bangkok, Thailand:165-74. https://he02.tci-thaijo.org/index.php/mdentjournal/article/view/243181.