TY - JOUR T1 - Informal payments by patients in Central and Eastern Europe during the COVID-19 pandemic: an institutional perspective JO - International Journal of Environmental Research and Public Health PY - 2021/10/17 AU - Horodnic AV AU - Williams CC AU - Drugă RI AU - Incaltarau C ED - DO - DOI: 10.3390/ijerph182010914 PB - MDPI AG VL - 18 IS - 20 Y2 - 2025/03/13 ER -