1. Department of Management Science and Engineering, Faculty of Engineering, University of Waterloo , 200 University Ave. W., Waterloo, ON N2L 3G1, Canada . e-mail: kejia.zhu@uwaterloo.ca
2. Organizational Behaviour and Human Resources Division, Sauder School of Business, University of British Columbia , 2053 Main Mall, Vancouver, BC V6T 1Z2, Canada . e-mail: martin.schulz@sauder.ubc.ca