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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

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 SA : Patient-based outcomes for the operative treatment of