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Keren, N., Scott, K. M., Tsuda, M., Barnwell, J., Knibb, J. A., Ellis, C. M., Leigh, P. N., Shaw, C. E., & Al-Chalabi, A. (2014). evidence of an environmental effect on survival in ALS. Amyotrophic lateral sclerosis and frontotemporal degeneration, 15(7), 528–533. http://access.bl.uk/ark:/81055/vdc_100025188767.0x000048