RT Journal Article SR Electronic T1 The Authors' Reply JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 341 OP 342 VO 13 IS 5 A1 William C. Eckelman A1 George Meinken A1 Powell Richards YR 1972 UL http://jnm.snmjournals.org/content/13/5/341.abstract AB