Funding for this research was provided by:
the research fund of Rheumatology Research Foundation (RRF-2017-01)
Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education (2016R1D1A1B03934716)
Text and Data Mining valid from 2018-05-30
Received: 26 April 2018
Accepted: 29 May 2018
First Online: 30 May 2018
Compliance with ethical standards
: The authors have declared no conflict of interest.
: The present study was approved by the Research and Ethical Review Board of Pusan National University Hospital (IRB No. 1603-005-039). All study participants provided written informed consent in accordance with the principles of the Declaration of Helsinki.