1. Department of Business Management, National Taipei University of Technology, 1, Sec. 3, Zhongxiao E. Rd., Taipei City, TW 10608, email: fengyi@mail.ntut.edu.tw
2. Department of Business Administration, National Taipei College of Business, Zhongzheng District, Taipei City, TW 100 (Corresponding author), e-mail: ychinc@webmail.ntcb.edu.tw
3. Department of Business Management, National Taipei University of Technology, 1, Sec. 3, Zhongxiao E. Rd., Taipei City, TW 10608.