Egenvall, A.; Nødtvedt, A.; Häggström, J.; Ström Holst, B.; Möller, L.; Bonnett, B. N. (2009). "Mortality of Life-Insured Swedish Cats during 1999—2006: Age, Breed, Sex, and Diagnosis". Journal of Veterinary Internal Medicine 23 (6): 1175–1183. doi:10.1111/j.1939-1676.2009.0396.x. PMID 19780926