In (1), the affiliation information for the corresponding author, Hae-Young Kim, DDS, PhD, is incorrect, and should appear as listed below:
+ Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Korea.
Hae-Young Kim, DDS, PhD
Department of Dental Laboratory Science and Engineering
College of Health Science
San 1 Jeongneung 3-Dong, Seongbuk-Gu, Seoul 136-703, Republic of Korea
We apologize for this error.