Affiliation: | 1Department of Radiology, University of New Mexico Health Sciences Center, 915 Camino de Salud, Albuquerque, NM 87131, USA;2Lovelace Respiratory Research Institute, Albuquerque, NM, USA;3Nycomed Amersham, Wayne, Pa, USA;4Abbott Laboratories, Drug Research and Development, Hospital Products Division, Abbott Park, Ill, USA;5DuPont Merck Pharmaceutical Company, Stine-Haskell Research Laboratories, Newark, Del, USA |