To the Editor:
The authors regret that there was error in author’s affiliation. Only the hospital name was described for the institution of corresponding author and it was advised to add the name of the university.
Content of correction:
2Division of Rheumatology, Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea
→ 2Division of Rheumatology, Department of Internal Medicine, Pusan National University School of Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea