In vivo and in vitro release of lysozyme from cross-linked gelatin hydrogels: a model system for the delivery of antibacterial proteins from prosthetic heart valves - Kuijpers, A J; van Wachem, P B; van Luyn, M JA; Engbers, G HM; Krijgsveld, J; Zaat, S AJ; Dankert, J; Feijen, J (J Control Release, 2000)