1. Department of Mathematics, Hong Kong University of Science and Technology, Hong Kong, Hong Kong;
2. Division of Biostatistics, UC Berkeley, Berkeley, CA;
3. Department of Biostatistics, Columbia Mailman School of Public Health, New York, NY;
4. Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA;
5. Department of Biostatistics, MD Anderson Cancer Center, Houston, TX