1. Institute of Science & Technology in Medicine, Keele University, The Guy Hilton Research Centre, Thornburrow Drive, Hartshill, Stoke-on-Trent, Staffordshire, ST4 7QB, UK.
2. Robert Jones & Agnes Hunt Hospital, Oswestry, UK
3. Biotechnology Research Unit, Department of Biological Sciences, Middle East Technical University, Ankara, Turkey
4. Institute of Biomaterials, Tampere University of Technology, Tampere, Finland