Competing interests statement:
Liz provides writing, editing, training and consultancy services for various pharmaceutical companies (most recently Astra Zeneca, Cephalon, Cordis, GlaxoSmithKline, Eli Lilly, Janssen-Cilag, Merck Serono, Mundipharma, Norgine, Novo Nordisk, Sanofi Pasteur and Vifor), publishers (including the BMJ Group and Wiley–Blackwell) and academic / professional / not-for-profit organisations (such as the Canadian Institutes of Health Research, the Open University, the Royal College of General Practitioners, the Vienna School of Clinical Research, the World Health Organization and the University of Oxford). She has received a research grant from COPE for a project on retractions, on which she is collaborating with researchers from University College, London. Liz was Visiting Fellow of the UK Cochrane Centre 1996-2010 (this position was unpaid). Liz also does pro bono work for the Cochrane Collaboration and the World Health Organization. Liz is an (unpaid) member of the ethics committees for the BMJ and the World Association of Medical Editors.