ocol, Spondylolisthesis Fundng/sup . 771s reseafcti was supported by a grant of the Koran Heath Technology= Praed through the Korea Heath industry Degdoprent &Istituto (KHO). funded by the Ministry of Heath & Welfare. Ropt.tk of Korea (grant number H(16C1626). The mews have no Luillias of interest to dscbse. •De