Sondermeijer HP, Witkowski P, Woodland D, Seki T, Aangenendt FJ, van der Laarse A, Itescu S, Hardy MA. Optimization of alginate purification using polyvinylidene difluoride membrane filtration: Effects on immunogenicity and biocompatibility of three-dimensional alginate scaffolds. J Biomater Appl. 2016 10; 31(4):510-520.