1. Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA;
2. NGO Infection Control Ukraine, Kyiv, Ukraine;
3. Department of Pediatrics, Warren Alpert Medical School of Brown University, Providence, RI, USA;, Center for International Health Research, Rhode Island Hospital, Providence, RI, USA;
4. Department of Medicine, Warren Alpert Medical School of Brown University, Providence, RI, USA;
5. Bogomolets National Medical University, Kyiv, Ukraine;
6. Departments of Global Health, Epidemiology, Biostatistics and Medicine, Boston University, Boston, MA, USA;
7. Public Health Center of the Ministry of Health, Kyiv City, Ukraine