1. Sydney Melanoma Unit, Royal Prince Alfred and Mater Hospitals, Sydney, New South Wales, Australia
2. Department of Surgical Oncology, Groningen University Medical Centre, Groningen, The Netherlands
3. Biostatistics and Bioinformatics Unit, Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, Alabama, USA
4. Discipline of Surgery, The University of Sydney, Sydney, New South Wales, Australia