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Ulrike Held, Johann Steurer, Giuseppe Pichierri, Maria M. Wertli, Mazda Farshad, Florian Brunner, Roman Guggenberger, François Porchet, Tamás F. Fekete, Urs D. Schmid, Isaac Gravestock and Jakob M. Burgstaller

spinal stenosis in older adults . JAMA 303 : 1259 – 1265 , 2010 15 DiPrete TA , Gangl M : Assessing bias in the estimation of causal effects: Rosenbaum bounds on matching estimators and instrumental variables estimation with imperfect instruments . Sociol Methodol 34 : 271 – 310 , 2004 16 Fekete TF , Loibl M , Jeszenszky D , Haschtmann D , Banczerowski P , Kleinstück FS , : How does patient-rated outcome change over time following the surgical treatment of degenerative disorders of the thoracolumbar spine? Eur Spine J 27 : 700 – 708