1. Department of Biostatistics, Brown University , Providence, Rhode Island , USA
2. Department of Pharmacy Practice, University of Rhode Island , Providence, Rhode Island , USA
3. Department of Biostatistics, Johns Hopkins University , Baltimore, Maryland , USA
4. Department of Population Health, NYU Grossman School of Medicine , New York, New York , USA
5. Biostatistics, Bioinformatics, and Epidemiology Program, Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center , Seattle, Washington , USA
6. Department of Biostatistics, University of Washington , Seattle, Washington , USA
7. Department of Computer Science and Statistics, University of Rhode Island , Providence, Rhode Island , USA
8. Medical School, University of Cyprus , Nicosia , Cyprus