1 Department of Old Age Psychiatry, Institute of Psychiatry, Psychology, and Neuroscience, King's College London, UK; Division of Psychiatry, Departments of Internal Medicine, China Medical University Beigang Hospital, Yunlin, Taiwan; Sleep Medicine Center and Mind-Body Interface Laboratory, China Medical University Hospital, Taichung, Taiwan. Electronic address: ta-wei.guu@kcl.ac.uk.
3 Department of Old Age Psychiatry, Institute of Psychiatry, Psychology, and Neuroscience, King's College London, UK.
4 Department of Old Age Psychiatry, Institute of Psychiatry, Psychology, and Neuroscience, King's College London, UK; Centre for Age-Related Medicine, Stavanger University Hospital, Stavanger, Norway; National Institute for Health Research, Maudsley Biomedical Research Centre, South London and Maudsley NHS Foundation Trust, UK.
5 Department of Old Age Psychiatry, Institute of Psychiatry, Psychology, and Neuroscience, King's College London, UK; National Institute for Health Research, Maudsley Biomedical Research Centre, South London and Maudsley NHS Foundation Trust, UK.
6 Department of Old Age Psychiatry, Institute of Psychiatry, Psychology, and Neuroscience, King's College London, UK; University Hospital of Old Age Psychiatry, University of Bern, Bern, Switzerland.