Theodore E Warkentin1. 1. Dr. T. Warkentin, Hamilton Regional Laboratory Medicine Program, Room 1-180A, Hamilton Health Sciences (Hamilton General Site), 237 Barton St. E., Hamilton, Ontario, L8L 2X2, Canada, Tel: +1 905 527 0271, Fax: +1 905 577 1421, E-mail: twarken@mcmaster.ca.