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Diemert, P., Seiffert, M., Frerker, C., Thielsen, T., Kreidel, F., Bader, R., Schirmer, J., Conradi, L., Koschyk, D., Schnabel, R., Reichenspurner, H., Blankenberg, S., Kuck, K., Treede, H., & Schaefer, U. (n.d.). valve‐in‐valve implantation of a novel and small self‐expandable transcatheter heart valve in degenerated small surgical bioprostheses: The Hamburg experience. Catheterization and cardiovascular interventions, 84(3), 486–493. http://access.bl.uk/ark:/81055/vdc_100025051481.0x000030