1. Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
2. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
3. Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, Texas 79409, United States
4. Department of Veterinary Population Medicine, University of Minnesota, St. Paul, Minnesota 55108, United States