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| web | | Environmental Integrity Projec... | 2024-06-12 |
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| web | Emily Holden | The Guardian | 2019-05-22 |
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| web | | AFP | 2014-11-27 |
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| web | David Heathemail | Center for Public Integrity | 2014-08-08 |
| web | Elizabeth Fernandez | UCSF | 2014-05-13 |
| web | E Pretorius | European Journal of Clinical N... | 2012-05-16 |
| web | R.G. Liteplo, R. Beauchamp, M.... | World Health Organization | 2002-01-01 |