1. a Department of Electronics, Microwave Tomography and Materials Research Laboratory, Cochin University of Science and Technology, Kochi-682 022, India
2. b Department of Electronics, Microwave Tomography and Materials Research Laboratory, Cochin University of Science and Technology, Kochi-682 022, India
3. c Department of Electronics, Microwave Tomography and Materials Research Laboratory, Cochin University of Science and Technology, Kochi-682 022, India
4. d Department of Electronics, Microwave Tomography and Materials Research Laboratory, Cochin University of Science and Technology, Kochi-682 022, India
5. e Department of Medicine, Medical College, Trivandrum-695 011, India
6. f Department of Electronics, Microwave Tomography and Materials Research Laboratory, Cochin University of Science and Technology, Kochi-682 022, India