1. Department of Food Service Management, Youngsan University, Busan, South Korea
2. School of Hotel and Restaurant Administration, College of Human Sciences, Oklahoma State University, Stillwater, OK, USA
3. Department of Food Service and Management, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
4. College of Hospitality and Tourism Management, Sejong University, Seoul, South Korea