[1] Samsung Med Ctr, Dept Family Med & Support Care Ctr, Seoul, South Korea
[2] Sungkyunkwan Univ, Sch Med, Dept Med, Seoul, South Korea
[3] DePaul Univ, Dept Psychol, Chicago, IL USA
[4] Samsung Med Ctr, Dept Thorac & Cardiovasc Surg, Seoul, South Korea
[5] Sungkyunkwan Univ, Samsung Adv Inst Hlth Sci & Technol SAIHST, Dept Clin Res Design & Evaluat, 81 Irwon Ro, Seoul 06351, South Korea