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| web | Environmental Working Group | 2019-02-07 | ||
| web | Anthony King | Chemistry World | 2017-11-21 | |
| web | Joy Mccarthy | Globe and Mail | 2014-11-21 | |
| web | LaMont Jones | Pittsburgh Post-Gazette | 2006-07-18 | |
| web | Lisa Girion | Reuters | 2018-12-14 | |
| web | Andrew Schneider | Hearst Newspapers | 2014-10-31 |