Stephen Pow1, Frank W Stahnisch2. 1. Departments of Community Health Sciences and History, Hotchkiss Brain Institute and O'Brien Institute for Public Health, University of Calgary, 3280 Hospital Drive N.W., Calgary, AB, T2N 4Z6, Canada. 2. Departments of Community Health Sciences and History, Hotchkiss Brain Institute and O'Brien Institute for Public Health, University of Calgary, 3280 Hospital Drive N.W., Calgary, AB, T2N 4Z6, Canada. fwstahni@ucalgary.ca.