1. a Institute of Statistical Science , Academia Sinica , Taipei, Taiwan
2. b Biostatistics Division, Moffit Cancer Center and Research Institute , University of South Florida , Tampa, Florida, USA
3. c Division of Biometry and Risk Assessment , National Center for Toxicological Research, Food and Drug Administration , Jefferson, Arkansas, USA
4. d Department of Surgery , John Hopkins Medical Institutions , Baltimore, Maryland, USA
5. e Sydney Melanoma Unit , Sydney Cancer Centre, Royal Prince Alfred Hospital , Camperdown, New South Wales, Australia
6. f Biostatistics and Bioinformatics Unit , University of Alabama at Birmingham , Birmingham, Alabama, USA