1. State Key Laboratory of Electrical Insulation and Power Equipment, Centre for Plasma Biomedicine, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China
2. Frank Reidy Center for Bioelectrics, Old Dominion University, Norfolk, Virginia 23508, USA
3. Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, Virginia 23529, USA