[1] Dankook Univ, Dept Dent Anesthesiol, Cheonan Si, Chungcheongnam, South Korea
[2] Seoul Natl Univ, Sch Dent, Dept Pediat Dent, Seoul 110768, South Korea
[3] Korea Univ, Coll Med, Dept Neurol, Seoul 136705, South Korea
[4] Jeju Med Ctr Jeju Special Self Governing Prov, Dept Neurol, Jeju City, Jeju Special Se, South Korea