**Acknowledgement**

The study was carried out at College of Electrical and Mechanical Engineering (CEME), NUST in collaboration with Armed Forces Institute of Rehabilitation Medicine (AFIRM). The author is highly indebted to Brig. Dr. Javaid Iqbal and Dr. Umer Shahbaz Khan for their help in the study and CEME for providing necessary funds to make this research possible. Special thanks to all colleagues and people who have willingly helped out with their abilities.
