1. Science and Technical Group, Department of Conservation, Hamilton, New Zealand
2. Faculty of Agriculture and Life Sciences, Department of Ecology, Lincoln University, Canterbury, New Zealand
3. Cawthron Institute, Nelson, New Zealand
4. Steroid and Immunobiochemistry Unit, Canterbury Health Laboratories, Christchurch, New Zealand
5. School of Population Health, University of Auckland, New Zealand
6. Rolleston Veterinary Clinic, Rolleston, Canterbury, New Zealand