pdf Naumova, E. N., Yepes, H., Griffiths, J. K., Sempértegui, F., Khurana, G., Jagai, J. S., … Estrella, B. (2007) Popular

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Emergency room visits for respiratory conditions in children increased after Guagua Pichincha volcanic eruptions in April 2000 in Quito, Ecuador Observational Study: Time Series Analysis. Environmental Health, 6(1), 21.

https://doi.org/10.1186/1476-069X-6-21