@article{ref1,
title="Gathering of data for epidemiological studies",
journal="Anales Espanoles de Pediatria",
year="1974",
author="Sevilla, J. M.",
volume="7",
number="Suppl 1",
pages="51-52",
abstract="<p>[Abstract unavailable]</p><p>Language: es</p>",
language="es",
issn="0302-4342",
doi="",
url="http://dx.doi.org/"
}