1. Department of Biostatistics The University of Texas School of Public Health 1200 Herman Pressler, Suite W‐928 Houston, TX 77030 USA
2. Department of Integrative Oncology, British Columbia Cancer Research Centre 675 West 10th Ave Vancouver, BC, V5Z 1L3 Canada
3. Department of Statistics Rice University 6100 Main St. Houston, TX 77005 USA
4. Department of Obstetrics and Gynecology, Brookdale Hospital and Medical Center 555 Rockaway Pkwy Brooklyn, NY 11212 USA
5. Department of Health Services Research The University of Texas MD Anderson Cancer Center P.O. Box 301402, Unit 1444 Houston, TX 77230‐1402 USA