title: Poland.
authors.affiliation: Department of Paediatrics and Nephrology, University Children's Hospital, Warsaw University Medical School, Poland.
authors.forename: M
authors.initials: M
authors.lastname: Sieniawska
mesh_terms: D002648:Child; D002662:Child Health Services / Q000458:organization & administration*; D002675:Child, Preschool; D006801:Humans; D008427:Maternal Health Services / Q000458:organization & administration; D010372:Pediatrics / Q000458:organization & administration*; D011044:Poland