Mariia Kuleba, MD, is a Research Assistant in the Household Economics and Health Systems Research unit of the Epidemiology and Public Health department at the Swiss Tropical and Public Health Institute. Her research is focused on immunization of zero-dose children. Mariia holds an MMed from the Lviv National Medical University. She worked as a pediatric resident in Kyiv, Ukraine, and as a research assistant at ETH Zurich, Switzerland.