1. Department of Management, Ewha School of Business, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea . e-mail: choise@ewha.ac.kr
2. Department of Management, Michigan State University , 632 Bogue Street, N475 BCC, East Lansing, MI 48824-1122, USA . e-mail: millerk@broad.msu.edu