1. Department of Mathematics and Statistics Mississippi State University Mississippi State MS USA
2. Clinical Trials Methods and Outcomes Lab PAIR (Palliative and Advanced Illness Research) Center Perelman School of Medicine University of Pennsylvania Philadelphia PA USA
3. Department of Biostatistics Epidemiology and Informatics Perelman School of Medicine University of Pennsylvania Philadelphia PA USA
4. Department of Biostatistics Yale University School of Public Health New Haven CT USA
5. Center for Methods in Implementation and Prevention Science Yale University New Haven CT USA