Fletcher S E, Cheatham J P, Froeming S
Joint Division of Pediatric Cardiology, University of Nebraska Medical Center/Creighton University, Omaha 68114, USA.
Cathet Cardiovasc Diagn. 1998 May;44(1):40-4. doi: 10.1002/(sici)1097-0304(199805)44:1<40::aid-ccd10>3.0.co;2-t.