COMPARATIVE EVALUATION OF PRF COMBINED WITH XENOGRAFT (STICKY BONE) vs CORONALLY ADVANCED FLAP SURGERY IN THE TREATMENT OF STAGE I / II WITH GRADE A/B PERIODONTITIS- A CLINICAL STUDY. EIJAS [Internet]. 2023 Sep. 9 [cited 2025 Oct. 9];9(3):1-9. Available from: http://eijas.com/index.php/as/article/view/204