Correction: Characterization of Human Mesenchymal Stem Cells from Ewing Sarcoma Patients. Pathogenetic Implications

In the Funding statement, multiple funding organizations and grants to multiple authors are incorrectly omitted. The Funding statement should read:

Research in Enrique de Alava's lab is supported by the Ministry of Science and Innovation of Spain-FEDER (PI081828, RD06/0020/0059, PI110018, ISCIII, postdoc grant CD06/00001 to JLOG), the Fundação para a Ciência e Tecnologia, Ministério para a Investigação e Tecnologia, Portugal (ATA fellowship SFRH/BD/69318/2010) and the Red Temática de investigación del cáncer (RTICC, Spain). This work was also supported by the European Commission (FP7-HEALTH-2011-two-stage, Project ID 278742 EUROSARC). Katia Scotlandi's lab is also funded by AIRC, Italian Association for Cancer Research, (project 10452 to KS), Progetto FIRB- Accordi di programma 2010 COD, RBAP10447, and by the Italian Ministry of Health (Project IOR-2006-422755). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.