Authors: R A Patchell; P A Tibbs; J W Walsh; R J Dempsey; Y Maruyama; R J Kryscio; W R Markesbery; J S Macdonald; B Young Journal: N Engl J Med Date: 1990-02-22 Impact factor: 91.245
Authors: Michael G Hart; Robert Grant; Ruth Garside; Gabriel Rogers; Margaret Somerville; Ken Stein Journal: Cochrane Database Syst Rev Date: 2011-03-16