Corresponding Author

Elderly Frailty Research Center, Department of Family Medicine, College of Medicine, Kyung Hee University, Seoul, Korea

Department of Family Medicine, Kyung Hee University Medical Center, Seoul, Korea

Correspondence

Professor Chang Won Won MD PhD, Department of Family Medicine, College of Medicine, Kyung Hee University, 23 Kyung Hee Dae-ro, Dongdaemun-gu, Seoul, 02447, Korea.

Email: chunwon62@naver.com