Question of the month--February 1994.
H R
HR
Ham
D001980:Bronchi / Q000000981:diagnostic imaging; D006207:Half-Life; D006801:Humans; D007727:Krypton Radioisotopes; D007830:Larynx / Q000000981:diagnostic imaging; D008168:Lung / Q000000981:diagnostic imaging*; D011877:Radionuclide Imaging; D012119:Respiration; D014980:Xenon Radioisotopes
D007727:Krypton Radioisotopes; D014980:Xenon Radioisotopes