About the Authors

Clive Ballard

Clive.ballard@kcl.ac.uk

Affiliation Wolfson Centre for Age-Related Diseases, King’s College London, London, United Kingdom

Emma Jones

Affiliation Wolfson Centre for Age-Related Diseases, King’s College London, London, United Kingdom

Nathan Gauge

Affiliation Wolfson Centre for Age-Related Diseases, King’s College London, London, United Kingdom

Dag Aarsland

Affiliations Department of Neurobiology, Ward and Society, Karolinska Institute, Stockholm, Sweden, Norway, Faculty of Science and Technology, Stavanger University Hospital, Stavanger, Norway

Odd Bjarte Nilsen

Affiliation Faculty of Science and Technology, Stavanger University Hospital, Stavanger, Norway

Brian K. Saxby

Affiliation Institute of Ageing and Health, University of Newcastle, Newcastle, United Kingdom

David Lowery

Affiliation Research Department of Primary Care and Population Health, University College London, London, United Kingdom

Anne Corbett

Affiliation Research Directorate, Alzheimer’s Society (UK), London, United Kingdom

Keith Wesnes

Affiliation Centre for Human Psychopharmacology, Swinburne University, Melbourne, Australia

Eirini Katsaiti

Affiliation Wolfson Centre for Age-Related Diseases, King’s College London, London, United Kingdom

James Arden

Affiliation Department of Anaesthetics, King’s College Hospital, London, United Kingdom

Derek Amaoko

Affiliation Department of Anaesthetics, King’s College Hospital, London, United Kingdom

Nicholas Prophet

Affiliation Department of Anaesthetics, King’s College Hospital, London, United Kingdom

Balaji Purushothaman

Affiliation Department of Anaesthetics, King’s College Hospital, London, United Kingdom

David Green

Affiliation Department of Anaesthetics, King’s College Hospital, London, United Kingdom

Competing Interests

David Green has received honoraria and expenses for meetings organised by Covidien Inc, manufacturers of the BIS and Invos monitors. Keith Wesnes has a commercial interest in the computerized cognitive assessment battery used in the trial—the Cognitive Drug Research battery. None of the others have any conflicts of interest. This does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: CB EJ DA BKS DL KW DG. Performed the experiments: EJ NG BKS DL JA DA NP BP DG. Analyzed the data: NG OBN EK. Contributed reagents/materials/analysis tools: BKS KW DG. Wrote the paper: CB EJ NG DA OBN BKS DL AC KW EK JA DA NP BP DG. Interpreting data: CB EJ NG AC DG. Literature search: CB EJ NG DA DL AC EK DG.