A SURVEY ON WORKING ENVIRONMENT, PERFORMANCE AND SATISFACTION AMONG PEDIATRIC SONOGRAPHERS IN RUSSIA: FINDINGS AND DISCUSSION Статья Krotov I.A., Konovalov O.E., Terletskaya R.N., Zhukov S.V., Morozov A.M. Archiv Euromedica. European Scientific Society. Том 11. 2021. С. 5-8