1. Group of Biomaterials; Division of Chemistry; National Center for Scientific Research; Havana Cuba
2. Department of Macromolecular; Center of Biomaterials; University of Havana; Havana 10400 Cuba
3. Centre de Biomaterials i Enginyeria Tissular; Universitat Politécnica de Valéncia; 46022, Camí de Vera 14 Valéncia Spain