Media type: E-Article Title: Letters Contributor: Pouw, Martin H.; van Middendorp, Joost J.; Putz, Cornelia Published: Ovid Technologies (Wolters Kluwer Health), 2010 Published in: Spine, 35 (2010) 25, Seite E1447 Language: English DOI: 10.1097/brs.0b013e3181eb9260 ISSN: 0362-2436 Origination: Footnote: