%0 Journal Article %T Implications for Welfare, Productivity and Sustainability of the Variation in Reported Levels of Mortality for Laying Hen Flocks Kept in Different Housing Systems: A Meta-Analysis of Ten Studies %A Adrian G. Williams %A Claire A. Weeks %A Sarah L. Lambton %J Archive of "PLoS ONE". %D 2016 %R 10.1371/journal.pone.0146394 %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4703395/