To the Editor:
We found errors in our published article: J Korean Med Sci 2014; 29: 494-501.
As two of authors, Young Ok Baik and Seuk Keun Choi belong to Department of Biotechnology, Korea University as well as EuBiologics Co., Ltd, the affiliated institute is added and marked as Yeong Ok Baik,1,4 Seuk Keun Choi,1,4. In addition, Young Ok Baik is corrected as Yeong Ok Baik.