Cite as: Myrissa, A.; Wolff, M.; Martinelli, E.; Eichler, J.; Srinivasaiah, S.; Willumeit-Roemer, R.; Schaefer, U.; Weinberg, A.: Influence of impurities on the degradation performance of sintered and spark eroded Mg-0.9Ca alloy in an in vivo study. European Cells and Materials. 2015.