1. Otago Radiology; Suite 1; Marinoto Clinic; 72 Newington Ave. Dunedin 9010 New Zealand
2. Department of Anatomy - Otago School of Medical Sciences; University of Otago; P.O. Box 56 Dunedin 9054 New Zealand
3. Department of Mathematics and Statistics; University of Otago; P.O. Box 56 Dunedin 9054 New Zealand