Table 2.
SU, Seoul; GGB, Northern Gyeonggi-do; GGN, Southern Gyeonggi-do; KWD, Kangwon-do; CCB, Chungcheongbuk-do; CCN, Chungcheongnam-do; GSB, Gyeongsangbuk-do; GSN, Gyeongsangnam-do; JLB, Jeollabuk-do; JLN, Jeollanam-do; BS, Busan; JJD, Jeju-do; HIVD, herniated intervertebral disc.