Novartis Institutes of Biomedical Research (NIBR), Novartis Campus, Fabrikstrasse, Basel, Switzerland;2. Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK;3. Department of Psychiatry and Psychotherapy, University of Cologne, Cologne, Germany

Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany;4. Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK

Correspondence: Professor Sabine Bahn, Department of Chemical Engineering and Biotechnology, Novartis Institutes of Biomedical Research (NIBR), University of Cambridge, Tennis Court Road, Cambridge CB2 1QT, UK

E-mail: sb209@cam.ac.uk

Fax: +44-1223-334162