Messina S. COVID-19 Shortages: Clear guidelines and advanced directives could ease allocation decisions. VIB [Internet]. 2020 Apr. 26 [cited 2024 Jun. 29];6. Available from: https://journals.library.columbia.edu/index.php/silentscreenconference/%2525252525252525252525252525252525252525252509https:/journals.library.columbia.edu/index.php/bioethics/article/view/5832