%0 Journal Article %T Causes of mortality in laying hens in different housing systems in 2001 to 2004 %A Fossum, Oddvar %A Jansson, Désirée S %A Etterlin, Pernille Engelsen %A Vågsholm, Ivar %J Acta Veterinaria Scandinavica %V 51 %N 1 %P 1-9 %D 2009-12-01 %I BioMed Central %~ DeepDyve