1. Department of Biomedical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
2. Nonlinear Dynamics Research Center, Kyungpook National University, Daegu 41544, Republic of Korea
3. Department of Computer Software, Daegu Catholic University, Gyeongsan 38430, Republic of Korea
4. Department of Radiology, School of Medicine, Kyungpook National University, Daegu 41944, Republic of Korea