1. Department of Biostatistics, Yale University, New Haven, Connecticut, USA
2. Center for Methods in Implementation and Prevention Science, Yale University, New Haven, Connecticut, USA
3. Division of Biostatistics and Bioinformatics, Department of Public Health Sciences, Pennsylvania State University, Hershey, Pennsylvania, USA
4. Department of Biostatistics, University of Florida, Gainesville, Florida, USA
5. Department of Statistical Science, Duke University, Durham, North Carolina, USA