1 1] Centre for Stem Cell Biology, Department of Biomedical Science, University of Sheffield Western Bank, Sheffield, UK.  Coordinator of the International Stem Cell Initiative.
2 Alliance for Regenerative Medicine/Athersys, Cleveland, Ohio, USA.
3 International Society for Cell Therapy, Vancouver, BC, Canada.
4 American Society of Hematology, University of Toronto and Princess Margaret Cancer Centre, Toronto, ON, Canada.
5 1] National Institutes of Health Center for Regenerative Medicine, Bethesda, Maryland, USA.  New York Stem Cell Foundation, New York, New York, USA.
6 Scottish National Blood Transfusion Service Headquarters, Edinburgh, UK.
7 Scottish Center for Regenerative Medicine, University of Edinburgh, Edinburgh BioQuarter, Edinburgh, UK.
8 1] Kyoto Center for iPS Cell Research and Application, Kyoto University, Shogoin, Sakyo-ku, Kyoto, Japan.  International Society for Stem Cell Research at the time of submission and acceptance of this work.