%0 Letter %T Efficacy of dual-frequency noninvasive monopolar radiofrequency in skin tightening: Histological evidence. %A Hong J %A Ryu HG %A Park C %A Park J %A Kim K %A Lee KMM %A Chun SI %J Skin Res Technol %V 30 %N 6 %D 2024 Jun %M 38881041 %F 2.24 %R 10.1111/srt.13821