Bibliographical noteFunding Information:
We thank the volunteers who took part in the study. We also thank Vicky Lupson and Peter Drivas for their assistance with the fMRI study. This work was supported by the Wellcome Trust (to A.A.v.d.K., I.S.F., P.C.F.), the National Institute for Health Research Cambridge Biomedical Research Centre (I.S.F.), the European Research Council (I.S.F.), the Bernard Wolfe Health Neuroscience Fund (A.A.v.d.K., P.C.F., H.Z., I.S.F.).