Authors: C A Ryan; M K Nickels; N T Hargrett-Bean; M E Potter; T Endo; L Mayer; C W Langkop; C Gibson; R C McDonald; R T Kenney Journal: JAMA Date: 1987-12-11 Impact factor: 56.272
Authors: A Faustini; M Sangalli; M Fantasia; R Manganello; E Mattaccini; R Trippanera; D Spera; U La Rosa; M T Topi; F Forastiere; C A Perucci Journal: Eur J Epidemiol Date: 1998-01 Impact factor: 8.082