1. Division of Biostatistics, School of Medicine, Washington University in St Louis, St Louis, MO, USA;
2. Genentech, Inc, South San Francisco, CA, USA;
3. Dignity Health, St Joseph’s Hospital and Medical Center, Phoenix, AZ, USA;
4. Department of Biostatistics, The University of Alabama at Birmingham School of Public Health, Birmingham, AL, USA;
5. Department of Internal Medicine and Community Health Sciences, University of Manitoba, Winnipeg, MB, Canada