1 Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia. Electronic address: s.bullis@uq.net.au.
2 Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia; Oral and Maxillofacial Department, Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia; Oral and Maxillofacial Department, Princess Alexandra Hospital, Brisbane, Queensland, Australia.
3 Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia; Oral and Maxillofacial Department, Princess Alexandra Hospital, Brisbane, Queensland, Australia; School of Dentistry, University of Queensland, Brisbane, Queensland, Australia.