Keyword Connections

case-crossover study

Journals

1

1 zhonghua liu xing bing xue za zhi = zhonghua liuxingbingxue zazhi

Research Groups

0

No Research Group Connected

Bibliographies

1

1 [Relationship between exposure to air pollutants during pre-pregnancy or early pregnancy and birth defects in Xi'an, 2013-2015: a case crossover study].