1. Center for Stem Cell Biology and Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, Tennessee, USA
2. Swiss Institute for Experimental Cancer Research, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
3. DanStem, University of Copenhagen, Copenhagen N, Denmark
4. Department of Pediatrics, Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana, USA
5. Penn Center for Bioinformatics and Department of Genetics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA