tokens: This research was partially supported by the Munich Institute for Astro- and Particle Physics (MIAPP) of the DFG cluster of excellence “Origin and Structure of the Universe”. S.L., A.S., E.C., A.B. acknowledge partial support from PRIN-MIUR 2010-2011 PI Francesca Matteucci Evoluzione chimica e dinamica della nostra galassia e delle galassie del gruppo locale. E.V. acknowledges support by grants NASA-NNX13AF45G and HST-12830.01-A.
ner_tags: O O O O O O O B-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization B-Organization O O B-Organization B-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization B-Person B-Person B-Person B-Person O O O O B-Organization B-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant B-Person O O O B-Grant I-Grant O B-Grant