1. Statistical Genetics Lab, QIMR Berghofer Medical Research Institute, 300, Herston road; Brisbane QLD 4006 Australia
2. Cancer Epidemiology and Services Research, Sydney School of Public Health; The University of Sydney; Sydney NSW Australia
3. Melanoma Institute Australia, University of Sydney; North Sydney NSW Australia
4. Centre for Cancer Research; Westmead Institute for Medical Research, University of Sydney; Westmead 2145 NSW Australia
5. Centre for Genetic Origins of Health and Disease, Faculty of Medicine and Health Sciences; The University of Western Australia; Crawley WA Australia
6. Department of Epidemiology and Biostatistics; Memorial Sloan Kettering Cancer Center; New York NY USA
7. Section of Epidemiology and Biostatistics; Leeds Institute of Cancer and Pathology, University of Leeds; Leeds United Kingdom