1 Department of Family Medicine, Cumming School of Medicine, Health Sciences Center, University of Calgary, Room G012, 3330 Hospital Drive Northwest, Calgary, AB, T2N 4N1, Canada. sllocker@ucalgary.ca.
2 Department of Family Medicine, Cumming School of Medicine, Health Sciences Center, University of Calgary, Room G012, 3330 Hospital Drive Northwest, Calgary, AB, T2N 4N1, Canada.