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Funding This work was supported by GEHES project and SOPHIE project, grant number CSO2009-12536 (for GEHES), 278173 (for SOPHIE). This study was partially supported by the Spanish Ministry of Science and Innovation (Ref. CSO2009-12536) and PLAN E. (Financiado por MICINN (Ref. CSO2009-12536) y Plan E). The research leading to these results has also received funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under grant agreement number 278173 (SOPHIE project).
Competing interests None.
Provenance and peer review Commissioned; externally peer reviewed.
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