Author/Authors :
CHOI, Yu-Ri Dept. of Dental Hygiene - Hallym Polytechnic University - Chuncheon - Republic of Korea , JANG, Sun-Ok Dept. of Dental Hygiene - Hallym Polytechnic University - Chuncheon - Republic of Korea , SHIM, Youn-Soo Dept. of Dental Hygiene - College of Health Science - Sunmoon University - Asan - Republic of Korea , NAM, Seoul-Hee Dept. of Dental Hygiene - Kangwon National University - Samcheok - Republic of Korea , HAN, Gyeong-Soon Dept. of Dental Hygiene - College of Health Science - Gachon University - Incheon - Republic of Korea