1. Department of Materials Science and Engineering; McMaster University; Hamilton L8S 4L7 Canada
2. Canadian Centre for Electron Microscopy; McMaster University; Hamilton L8S 4L7 Canada
3. Department of Biomaterials; Sahlgrenska Academy at University of Gothenburg; Göteborg 405 30 Sweden
4. University of Lyon; INSA Lyon; UCBL Lyon 1; MATEIS; UMR 5510 CNRS; Villeurbanne Cedex 69621 France
5. Department of Chemistry and Chemical Biology; McMaster University; Hamilton L8S 4M1 Canada