1. Department of Clinical Epidemiology, Institute of Clinical Medicine; Aarhus University Hospital; Aarhus Denmark
2. Department of Nuclear Medicine & PET Centre; Aarhus University Hospital; Aarhus Denmark
3. Department of Health Research & Policy (Epidemiology) and Clinical Excellence Research Center; Stanford University; Stanford California USA
4. Department of Health Research & Policy (Epidemiology); Stanford University; Stanford California USA
5. Department of Neurology & Neurological Sciences; Stanford University; Stanford California USA