Colombian Navy Lieutenant Commander Gabriel Villar Salinas, dental director for the Naval Hospital in Cartagena (center), demonstrates the uses of Leukocyte-and Platelet Rich-Fibrin (L-PRF) to medical professionals from the hospital ship USNS Comfort (T-AH 20), during a subject matter expert exchange at the Naval Hospital in Cartagena, Colombia, November 14, 2022. (Photo: U.S. Navy Mass Communication Specialist First Class James Mullen)