1. Institute of Biochemistry and Molecular Biology I, Heinrich-Heine University, Düsseldorf, Germany
2. Department of Geriatrics, Marienhospital Herne, Ruhr University Bochum, Germany
3. Department of Pharmacology, Temple University School of Medicine, Philadelphia, Pennsylvania, USA
4. Institute of Geriatrics and Gerontology, Perugia University Hospital, Perugia, Italy
5. Department of Neurology, St. Elisabeth-Krankenhaus Köln, Cologne, Germany