Kern M J, Puri S, Donohue T J, Bach R G
Department of Internal Medicine, Saint Louis University Health Sciences Center, Missouri 63110, USA.
Cathet Cardiovasc Diagn. 1998 Aug;44(4):438-42. doi: 10.1002/(sici)1097-0304(199808)44:4<438::aid-ccd18>3.0.co;2-e.