1. Department of Electronics Engineering, Incheon National University, Incheon 22012, Korea
2. Bio-Medical IT Convergence Research Division, Electronics and Telecommunications Research Institute, Daejeon 34129, Korea
3. Department of Psychiatry, Depression Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea
4. Department of Psychiatry, Korea University Anam Hospital, Korea University College of Medicine, Seoul 02841, Korea