Authors: L G Coelho; M C Passos; Y Chausson; E L Costa; A F Maia; M J Brandao; D C Rodrigues; L P Castro Journal: Scand J Gastroenterol Date: 1992-05 Impact factor: 2.423
Authors: E Hentschel; G Brandstätter; B Dragosics; A M Hirschl; H Nemec; K Schütze; M Taufer; H Wurzer Journal: N Engl J Med Date: 1993-02-04 Impact factor: 91.245