add dataset DOI

CONCIERGE-CM-UC3M · Jul 28, 2021 · c4c7f4b · c4c7f4b
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 # Mind the gender gap: COVID-19 lockdown effects on gender differences in research
 
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+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.5142676.svg)](https://doi.org/10.5281/zenodo.5142676)
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 Supporting methods and data.