1. Division of Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology (KTH), AlbaNova University Center, S-106 91 Stockholm, Sweden
2. Department of Neurobiology, Care Sciences and Society, Center of Alzheimer Research, Division of Clinical Geriatric, Karolinska Institutet, Huddinge, S-141 86 Stockholm, Sweden
3. Theme Aging, Karolinska University Hospital, Huddinge, S-141 86 Stockholm, Sweden
4. Department of Physics and Astronomy, Uppsala University, SE-751 20 Uppsala, Sweden