Wyer Peter C, Keitz Sheri, Hatala Rose, Hayward Robert, Barratt Alexandra, Montori Victor, Wooltorton Eric, Guyatt Gordon
Columbia University College of Physicians and Surgeons, New York, NY, USA.
CMAJ. 2004 Aug 17;171(4):347-8. doi: 10.1503/cmaj.1031665.