1. Department of Physics, NIT, Rourkela-769008, India
2. Institute of Physics, Bhubaneswar-751005, India
3. School of Physics, Seoul National University, Seoul, 151-747, Korea
4. Institute of Geological & Nuclear Sciences Ltd., 30, Gracefield Road, Lower Hutt, New Zeland
5. Dept. of Gastroenterology, Government Stanley Medical Hospital, Chennai, India
6. Dept. of Gastroenterology, Kalinga Hospital, Bhubaneswar-751023, India