@article{cruz ricardez_romero arroyo_2016,  title={INTERSPINOUS SPACER IN PERSISTENT DISCOGENIC PAIN: PERCUTANEOUS APPROACH OR OPEN TECHNIQUE},  volume={15},  ISSN={1808-1851},  url={https://doi.org/10.1590/S1808-185120161502155246},  DOI={10.1590/S1808-185120161502155246},  number={2},  journal={Coluna/Columna},  publisher={Sociedade Brasileira de Coluna},  author={Cruz Ricardez, José Antonio and Romero Arroyo, Jesús Alfonso Cao},  year={2016},  month={Apr},  pages={120–123} }