title: Patent Ductus Arteriosus　- A Complex Problem in Need of a Solid Conceptual Foundation.
authors.affiliation: Departments of Pediatrics and Obstetrics & Gynecology, The Ohio State University Wexner Medical Center.
authors.forename: Carl H
authors.initials: CH
authors.lastname: Backes
authors.forename: Charles V
authors.initials: CV
authors.lastname: Smith
mesh_terms: D004374:Ductus Arteriosus, Patent; D006801:Humans