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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

: 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 10.1111/j.0081-1750.2004.00154.x 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 , 2018 10.1007/s00586-017-5358-2 29080002 17 Fokter SK , Yerby