1. Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
2. Department of Neurobiology, Care Sciences and Society, Division of Clinical Geriatrics, Center for Alzheimer Research, Neo, 141 84 Stockholm, Sweden
3. Department of Chemistry - BMC, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
4. Theme Inflammation and Aging, Karolinska University Hospital, S-141 86 Stockholm, Sweden
5. College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, P. R. China