1. Department of Family Medicine, College of Medicine Kyung Hee University, Kyung Hee University Medical Center Seoul Korea
2. Department of Biomedical Science and Technology, College of Medicine/East‐West Medical Research Institute Kyung Hee University Seoul Korea
3. Elderly Frailty Research Center, Department of Family Medicine, College of Medicine Kyung Hee University, Kyung Hee University Medical Center Seoul Korea