Cell Stem Cell. 2021 Sep 1:S1934-5909(21)00342-8. doi: 10.1016/j.stem.2021.08.005. Online ahead of print. Cell Stem Cell. 2021. PMID: 34496297 . MMWR Morb Mortal Wkly Rep. 2021 Sep 10;70(36):1249-1254. doi: 10.15585/mmwr.mm7036e1. MMWR Morb Mortal Wkly Rep. 2021. PMID: 34499628 . Int Angiol. 1988 Apr-Jun;7(2 Suppl):17-9. Int Angiol. 1988. PMID: 3183452