First Author:   Calin Valsan Bishop's University cvalsan@ubishops.ca   2600 College Street Sherbrooke, J1M 0C8, Canada   819-822-9600(Phone) 819-822-9600(Fax) Second Author: Robert Sproule Bishop's University ra_sproule@shaw.ca   2600 College Street Sherbrooke, J1M 0C8, Canada   819-822-9600(Phone)