1. Department of Polymer Science; The University of Akron; Akron, OH. 44325-3909
2. Department of Life Science and Chemistry; Jacobs University, P.O. Box; 750 561, 28725 Bremen Germany
3. Department of Chemistry, Faculty of Sciences; University of Balamand, P.O. Box; 100 Tripoli Lebanon
4. Departamento de Química Inorgánica, Facultad de Ciencia y Tecnología; Universidad del País Vasco UPV/EHU, P. O. Box; 644, 48080 Bilbao Spain
5. BCMaterials; Parque Tecnológico de Bizkaia; Edificio 500, 48160 Derio Spain