| web | https://www.washingtonpost.com/news/to-your-health/wp/2017/02/21/outdoor-pollution-affects-preterm-birth-rates-study-shows/?utm_term=.4114819c7bff |
| author | Jia Naqvi |
| publication | Washington Post |
| date | 2017-02-23 |
| web | Christopher S. Malleya, Johan ... | Environment International | 2017-02-10 |
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