Languages:
| Document | Description |
|---|---|
 Level 1 | A short summary by GreenFacts of the below source document (7 pages, 0.2 MB) |
| Level 2 | A detailed summary by GreenFacts of the below source document (13 pages, 0.3 MB) |
| Level 3 - The source document produced in 2006 by the World Health Organization (WHO) : | |
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