Authors: Braden J Manns; Marcello Tonelli; Jianguo Zhang; David J T Campbell; Peter Sargious; Bharati Ayyalasomayajula; Fiona Clement; Jeffrey A Johnson; Andreas Laupacis; Richard Lewanczuk; Kerry McBrien; Brenda R Hemmelgarn Journal: CMAJ Date: 2011-12-05 Impact factor: 8.262