1. Department of Chemistry Dr. B. A. M. University Aurangabad Maharashtra 431004 India
2. Department of Physics Dr. B. A. M. University Aurangabad Maharashtra 431004 India
3. Department of Physics Vidnyan Vinayak Mahavidyalaya Nandgaon Khandeshwar Amravati Maharashtra India
4. Nuffield Department of Women's & Reproductive Health Medical Sciences Division University of Oxford Oxford OX3 9DU UK