J Rheum Dis 2019;26:66-73
The original version of this article contained an error of the acknowledgement (funding source).
The correct acknowledgement (funding source) is as follows:
This research was supported by a grant of the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare, Republic of Korea (grant number: HC17C0069).
The funding source has been already revised in the journal's online site.
We apologize for this error.