1. Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (B.H.U.), Varanasi, 221005 U.P., India
2. Department of Chemistry, Uppsala University, SE-751 20 Uppsala, Sweden
3. Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
4. Division of Clinical Geriatrics, Centre for Alzheimer Research, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, NEO, Eighth
Floor, 141 52 Stockholm, Sweden