1. School of Electronics and Telecommunications, Hanoi University of Science and Technology, 01 Dai Co Viet, Hanoi, Vietnam
2. Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, GR–54124, Greece
3. Biomedical Engineering Department, Amirkabir University of Technology, Tehran 15875-4413, Iran
4. Research and Development Centre, Vel Tech University, Avadi, Chennai 600062, India
5. Division of Dynamics, Lodz University of Technology, Stefanowskiego 1/15, 90-924 Lodz, Poland
6. Institute for Advanced Study, Shenzhen University, Shenzhen, Guangdong 518060, P. R. China