1. Department of Communication; Yonsei University; 50 Yonsei-ro, Seodaemun-gu Seoul 120-749 South Korea
2. Department of Advertising and Public Relations; Pyeongtaek University; 111 Yongi-dong Pyeongtaek-si Gyeonggi-do 450-701 South Korea
3. School of Communication; Dankook University; 126 Jukjeon-dong, Suji-gu Yongin-si Gyeonggi-do 110-810 South Korea