Authors' response.
Captain, Department of Dermatology, Armed Forces Seoul Hospital and Doctoral Student, College of Medicine, Korea University, Seoul, South Korea.
Yoo Sang
YS
Baek
Professor, Department of Conservative Dentistry, Seoul National University Dental Hospital School of Dentistry, Dental Research Institute, Seoul National University, Seoul, South Korea.
Seung-Ho
SH
Baek
Clinical Professor, Department of Conservative Dentistry & Comprehensive Treatment Center, Seoul National University Dental Hospital, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, South Korea.
Yeon-Jee
YJ
Yoo