Migration and the epidemiological approach: time and self-selection into foreign ancestries matter / Simone Bertoli (Université Clermont Auvergne, CNRS, IRD, CERDI and IZA), Melchior Clerc (Université Clermont Auvergne, CNRS, IRD and CERDI), Jordan Loper (Université Clermont Auvergne, CNRS, IRD and CERDI), Èric Roca Fernández (Université Clermont Auvergne, CNRS, IRD and CERDI) ; IZA Institute of Labor Economics