Authors: M Gwinn; M Pappaioanou; J R George; W H Hannon; S C Wasser; M A Redus; R Hoff; G F Grady; A Willoughby; A C Novello Journal: JAMA Date: 1991-04-03 Impact factor: 56.272
Authors: L G Burman; P Christensen; K Christensen; B Fryklund; A M Helgesson; N W Svenningsen; K Tullus Journal: Lancet Date: 1992-07-11 Impact factor: 79.321