Authors: R N Battista; J I Williams; J Boucher; E Rosenberg; S J Stachenko; J Adam; C Levinton; S Suissa Journal: CMAJ Date: 1991-06-01 Impact factor: 8.262
Authors: C D Austin; W B Carter; M L Durham; S C Hedrick; D H Hickam; T S Inui; T D Koepsell; R A Pearlman; M D Petersen; M L Rothman Journal: Health Serv Res Date: 1986-02 Impact factor: 3.402