David Townsend1, Nicola Campbell2, Claire Chandler3. 1. Maitland Hospital, Hunter New England Local Health District, Maitland, NSW david@davidtownsend.com.au. 2. Toowoomba Hospital, Darling Downs Hospital and Health Service, Toowoomba, QLD. 3. Northern Territory Medical Program, Flinders University, Adelaide, SA.