1. Division of Materials; Mechanics and Structures, Faculty of Engineering, University of Nottingham; Nottingham NG7 2RD United Kingdom
2. Purac Biomaterials; 5150 N Royal Atlanta DR. Tucker Georgia 30084
3. Department of Applied Oral Sciences; Faculty of Dentistry, Dalhousie University; Halifax Nova Scotia B3H 4R2 Canada
4. Department of Chemistry; Dalhousie University; Halifax Nova Scotia B3H 4J3 Canada