Bibliographical note

Funding Information:
This work was supported by a grant from the Danish Medical Research Council. Karin Stahr and the staff at the PET centre at Rigshospitalet, Copenhagen, are acknowledged for their participation. Egill Rostrup from the Danish Research Centre for Magnetic Resonance, Hvidovre Hospital, Denmark, is acknowledged for his participation in the acquisition of structural MRI scans. The John and Birthe Meyer Foundation is gratefully acknowledged for the donation of the Cyclotron and PET-scanner. Finally helpful comments by two reviewers are acknowledged.