Author contributions
Hwoon-Yong Jung: Study concept and design, study supervision, acquisition of data, revision of the manuscript, statistical analysis, interpretation of data, verified the underlying data. Hyun Lim: Acquisition of data, drafting of the manuscript, revision of the manuscript, interpretation of data,. Jae Myung Park, Jong Kyu Park, Jung Ho Park, Moo In Park, Gwang Ha Kim, Hyunsoo Chung, Sung Kwan Shin, Kwang Jae Lee, Si Hyung Lee, Suck Chei Choi, Hye-Kyung Jung, Jeong Seop Moon, Hyun-Soo Kim, Jae Kyu Sung, Seong Woo Jeon, Nayoung Kim, and Jong-Jae Park: Acquisition of data, revision of the manuscript. Sung Hee Hong and Na Young Kim: Study supervision, statistical analysis, revision of the manuscript, interpretation of data, verified the underlying data.