RT Journal Article SR Electronic T1 Part 1: Research Radionuclide Availability in North America JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 15N OP 19N VO 38 IS 7 A1 Linda E. Ketchum A1 Mark A. Green A1 Silvia S. Jurisson YR 1997 UL http://jnm.snmjournals.org/content/38/7/15N.abstract AB