1 Faculty of Medicine, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Montreal, QC, H3G 1Y6, Canada.
2 Department of Radiology, Faculty of Medicine, Montreal General Hospital Site, McGill University, 1650 Cedar Avenue, Rm C5 118, Montreal, QC, H3G 1A4, Canada.
3 McGill University Health Centre, McGill University, Glen site, 1001 Boul. Décarie, Montreal, QC, H4A 3J1, Canada.
4 Faculty of Medicine, McGill University, McIntyre Medical Building, 3655 Promenade Sir William Osler, Montreal, QC, H3G 1Y6, Canada. lmboucher@yahoo.com.
5 Department of Radiology, Faculty of Medicine, Montreal General Hospital Site, McGill University, 1650 Cedar Avenue, Rm C5 118, Montreal, QC, H3G 1A4, Canada. lmboucher@yahoo.com.
6 McGill University Health Centre, McGill University, Glen site, 1001 Boul. Décarie, Montreal, QC, H4A 3J1, Canada. lmboucher@yahoo.com.