1. Department of Biomedical Engineering, School of Electrical Engineering, University of Ulsan, Ulsan, South Korea
2. Center for Magnetic Resonance Research (CMRR), University of Minnesota, Minneapolis, MN, USA
3. Department of Radiological Science, College of Health Science, Gachon University, Incheon, South Korea
4. Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, USA