RT Journal Article SR Electronic T1 Governments are constitutionally permitted to provide ‘vaccine passports’ – we think some may also be constitutionally obligated to do so JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP jnumed.121.262434 DO 10.2967/jnumed.121.262434 A1 Kevin Cope A1 Alexander Stremitzer YR 2021 UL http://jnm.snmjournals.org/content/early/2021/04/15/jnumed.121.262434.abstract AB