AUTHOR CONTRIBUTIONS
Y. Yeo, H. Lee, J. Ryu, and J-Y. Moon were involved in study design. Y. Yeo, H. Lee, J. Ryu, S-H Kim, and J-Y. Moon were involved in data analysis. Y. Yeo, H. Lee, J. Ryu, and J-Y. Moon were involved in writing the manuscript. All authors were involved in reviewing and revising the manuscript.