Authors: R A Coates; V T Farewell; J Raboud; S E Read; D K MacFadden; L M Calzavara; J K Johnson; F A Shepherd; M M Fanning Journal: Am J Epidemiol Date: 1990-10 Impact factor: 4.897
Authors: R A Kaslow; W C Blackwelder; D G Ostrow; D Yerg; J Palenicek; A H Coulson; R O Valdiserri Journal: JAMA Date: 1989-06-16 Impact factor: 56.272