Authors: R Moynihan; L Bero; D Ross-Degnan; D Henry; K Lee; J Watkins; C Mah; S B Soumerai Journal: N Engl J Med Date: 2000-06-01 Impact factor: 91.245
Authors: M Melbye; J Wohlfahrt; J H Olsen; M Frisch; T Westergaard; K Helweg-Larsen; P K Andersen Journal: N Engl J Med Date: 1997-01-09 Impact factor: 91.245