1. Department of Biomedical Engineering, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia
2. Department of Electrical Engineering, Faculty of Engineering, Universitas Sumatera Utara, Medan, Indonesia
3. Department of Physics, Faculty of Science and Technology, Universitas Airlangga, Surabaya, Indonesia
4. Department of Electrical Engineering, State University of Malang, Malang, Indonesia
5. Institute of Industrial Science, The University of Tokyo, Tokyo, Japan