Authors: M L Freeman; D B Nelson; S Sherman; G B Haber; M E Herman; P J Dorsher; J P Moore; M B Fennerty; M E Ryan; M J Shaw; J D Lande; A M Pheley Journal: N Engl J Med Date: 1996-09-26 Impact factor: 91.245
Authors: J J Bergman; E A Rauws; P Fockens; A M van Berkel; P M Bossuyt; J G Tijssen; G N Tytgat; K Huibregtse Journal: Lancet Date: 1997-04-19 Impact factor: 79.321