Authors: P Saur; J Hildebrandt; M Pfingsten; D Seeger; U Steinmetz; A Straub; J Hahn; B Kasi; R Heinemann; D Koch Journal: Schmerz Date: 1996-10-28 Impact factor: 1.107
Authors: Nancy J O Birkmeyer; James N Weinstein; Anna N A Tosteson; Tor D Tosteson; Jonathan S Skinner; Jon D Lurie; Richard Deyo; John E Wennberg Journal: Spine (Phila Pa 1976) Date: 2002-06-15 Impact factor: 3.468