Authors: M H Frick; O Elo; K Haapa; O P Heinonen; P Heinsalmi; P Helo; J K Huttunen; P Kaitaniemi; P Koskinen; V Manninen Journal: N Engl J Med Date: 1987-11-12 Impact factor: 91.245
Authors: G Brown; J J Albers; L D Fisher; S M Schaefer; J T Lin; C Kaplan; X Q Zhao; B D Bisson; V F Fitzpatrick; H T Dodge Journal: N Engl J Med Date: 1990-11-08 Impact factor: 91.245