1. Biostatistics Program, Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
2. Department of Applied Mathematics and Statistics, Stony Brook University, Stony Brook, NY, USA
3. Office of Biostatistics, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD, USA
4. Department of Biostatistics and Bioinformatics, Duke University School of Medicine, Durham, NC, USA