Systematic review of platelet-rich fibrin (PRF) centrifugation protocols in oral and maxillofacial surgery and the introduction of AR2T3: an easy to remember acronym to correctly report vertical and horizontal PRF centrifugation - Herrera-Vizcaino, Carlos (Frontiers of Oral and Maxillofacial Medicine; Vol 5 (March 10, 2023): Frontiers of Oral and Maxillofacial Medicine, 2021)