RT Journal Article SR Electronic T1 Governments Are Constitutionally Permitted to Provide “Vaccine Passports”—Some May Also Be Constitutionally Obligated to Do So JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 771 OP 772 DO 10.2967/jnumed.121.262434 VO 62 IS 6 A1 Kevin Cope A1 Alexander Stremitzer YR 2021 UL http://jnm.snmjournals.org/content/62/6/771.abstract AB