1. School of Public Health; Curtin University; Perth Australia
2. School of Paediatrics and Child Health; The University of Western Australia; Perth Australia
3. School of Medicine; Shihezhi University; Xinjiang China
4. Biostatistical Analysis Pty Ltd; Australia
5. The University of Queensland; Brisbane Australia
6. Thoracic Surgery Department; Hebei General Hospital; Shijiazhuang People's Republic of China
7. Telethon Kids Institute, The University of Western Australia; Perth Australia