1. From the Danish Research Centre for Magnetic Resonance (J.R.M., E.G., E.R., P.R., S.R.), Hvidovre Hospital, Hvidovre, and Department of Health Psychology (E.L.M.), Institute of Public Health, University of Copenhagen, Copenhagen, Denmark; and MR-Centre, University Hospital Trondheim (H.B.W.L.), Trondheim, Norway.