<affiliation wicri:level="2"><nlm:affiliation>School of Public Health, University of North Carolina at Chapel Hill and the Carolina Population Center, Chapel Hill, North Carolina, United States of America.</nlm:affiliation>
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>School of Public Health, University of North Carolina at Chapel Hill and the Carolina Population Center, Chapel Hill, North Carolina</wicri:regionArea>
<placeName><region type="state">Caroline du Nord</region>
</placeName>
</affiliation>