1. Children's Cardiac Centre; Child & Adolescent Health Service; Perth WA Australia
2. Children's Cardiac Centre; Princess Margaret Hospital; Australia
3. School of Nursing, Midwifery & Paramedicine; Faculty of Health Sciences; Curtin University; GPO Box U1987 Perth Western Australia 6845 Australia
4. Princess Margaret Hospital for Children; Child & Adolescent Health Services; Western Australia Australia
5. Charles Sturt University; Bathurst NSW Australia
6. The University of Queensland; Brisbane Qld Australia