1. Dana‐Farber/Boston Children's Cancer and Blood Disorders Center Boston Massachusetts USA
2. Department of Statistics University of Washington Seattle Washington USA
3. Biostatistics Program School of Public Health, Louisiana State University Health Science Center New Orleans Louisiana USA
4. Harvard Medical School Boston Massachusetts USA
5. Centre for Addiction and Mental Health Toronto Canada
6. Division of Biostatistics, Dalla Lana School of Public Health University of Toronto Toronto Canada