PT - JOURNAL ARTICLE ED - , TI - Calendar DP - 1974 Jul 01 TA - Journal of Nuclear Medicine PG - 644--646 VI - 15 IP - 7 4099 - http://jnm.snmjournals.org/content/15/7/644.short 4100 - http://jnm.snmjournals.org/content/15/7/644.full SO - J Nucl Med1974 Jul 01; 15