1. Graduate School of Management, Ming Chuan University, 250, Section 5, Chung Shan North Road, Taipei 11103, Taiwan, R.O.C.
2. Department of Hotel and Restaurant Management, Chia-Nan University of Pharmacy and Science, 60, Section 1, Erh-Jen Road, Pao-An, Jen-Te Hsiang, Tainan 717, Taiwan, R.O.C.