[1] Seoul Natl Univ, Grad Sch Publ Hlth, Seoul, South Korea
[2] Seoul Natl Univ Hosp, Ctr Palliat Care & Clin Eth, Seoul, South Korea
[3] Seoul Natl Univ, Dept Human Syst Med, Coll Med, Seoul, South Korea
[4] Seoul Natl Univ Hosp, Publ Healthcare Ctr, Seoul, South Korea
[5] Seoul Natl Univ, Seoul Natl Univ Hosp, Coll Med, Dept Pediat, Seoul, South Korea
[6] Seoul Natl Univ, Inst Aging, Coll Med, Seoul, South Korea
[7] Seoul Natl Univ Hosp, Dept Neurol, Seoul 156707, South Korea
[8] Seoul Natl Univ Hosp, Publ Healthcare Ctr, 101 Daehak ro, Seoul 03080, South Korea