RT Journal Article SR Electronic T1 2014 Cassen Lecture: What Have We Learned from the National Oncologic PET Registry? JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 9N OP 15N VO 55 IS 12 YR 2014 UL http://jnm.snmjournals.org/content/55/12/9N.abstract AB