CHARITE versus ProDisc: a comparative study of a minimum 3-year follow-up. - Shim CS; Lee SH; Shin HD; Kang HS; Choi WC; Jung B; Choi G; Ahn Y; Lee S; Lee HY; Shim, Chan Shik; Lee, Sang-Ho; et al. (Spine (03622436), 2007)