{Reference Type}: Letter {Title}: Efficacy of dual-frequency noninvasive monopolar radiofrequency in skin tightening: Histological evidence. {Author}: Hong J;Ryu HG;Park C;Park J;Kim K;Lee KMM;Chun SI; {Journal}: Skin Res Technol {Volume}: 30 {Issue}: 6 {Year}: 2024 Jun {Factor}: 2.24 {DOI}: 10.1111/srt.13821