1. Oral Implantology Research Group; Sir John Walsh Research Institute; Faculty of Dentistry; University of Otago; Dunedin New Zealand
2. Private practice; Dunedin 9010 New Zealand
3. Department of Oral Sciences; Sir John Walsh Research Institute; Faculty of Dentistry; University of Otago; Dunedin New Zealand
4. Oral Sciences Department; Sir John Walsh Research Institute; Faculty of Dentistry; University of Otago; Dunedin New Zealand
5. Department of Chemistry; University of Otago; Dunedin New Zealand
6. Centre for Trace Element Analysis; University of Otago; Dunedin New Zealand