Letter to the Editor concerning "Charité total disc replacement: clinical and radiographical results after an average follow-up of 17 years" (M. Putzier et al.)
Eur Spine J. 2006 Apr;15(4):510-3; author reply 518-20, discussion 521-2.
doi: 10.1007/s00586-006-1081-0.
Epub 2006 Mar 4.