[1] Jeju Natl Univ, Dept Neuropsychiat, Cheju, South Korea
[2] Jeju Natl Univ, Coll Med, Inst Med Sci, Cheju, South Korea
[3] Jeju Natl Univ, Coll Med, Dept Obstet & Gynaecol, Cheju, South Korea
[4] Jeju Natl Univ, Coll Med, Dept Prevent Med, Cheju, South Korea
[5] Jeju Natl Univ, Coll Med, Dept Family Med, Cheju, South Korea
[6] Jeju Natl Univ, Coll Med, Dept Nursing Sci, Cheju, South Korea
[7] N Carolina State Univ, Dept Comp Engn, Raleigh, NC 27695 USA