title: Letter: Nonsurgical closure of PDA.
mesh_terms: D000367:Age Factors; D006328:Cardiac Catheterization / Q000009:adverse effects / Q000379:methods* / Q000401:mortality; D002675:Child, Preschool; D004374:Ductus Arteriosus, Patent / Q000601:surgery / Q000628:therapy*; D006801:Humans; D007223:Infant; D012306:Risk