Vilhelmsdotter Allander, S., Marké, L.- Åke, Wihlen, B., Svensson, M., Elinder, C.-G. and Larsson, A. (2012) “Regional variation in use of exogenous and endogenous glomerular filtration rate (GFR) markers in Sweden”, Upsala Journal of Medical Sciences, 117(3). doi: 10.3109/03009734.2012.664179.