Authors: R J Glassock; J A Benson; R B Copeland; H A Godwin; W G Johanson; W Point; R L Popp; L Scherr; J H Stein; O D Taunton Journal: Ann Intern Med Date: 1991-01-01 Impact factor: 25.391
Authors: J J Norcini; S C Day; L J Grosso; L O Langdon; H R Kimball; R L Popp; S E Goldfinger Journal: J Gen Intern Med Date: 1993-02 Impact factor: 5.128