1. Department of Recreation, Parks, and Leisure Services Administration, Central Michigan University, Mount Pleasant, MI 48859, USA
2. Tourism Research Institute, Kyonggi University, Suwon 16227, South Korea
3. Department of History and Geography, Clemson University, Clemson, SC 29634, USA
4. Department of Recreation Park and Tourism Sciences, Texas A&M University, College Station, TX 77843-2261, USA