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Full text from AIR - Univ. Milan free resource Archivio Istituzionale della Ricerca Unimi https://air.unimi.it/handle/2434/863188
Free full text from BORIS free resource Bern Open Repository and Information System https://boris.unibe.ch/id/eprint/163299
free resource Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S0140-6736(21)01207-1
Global Health free resource MedlinePlus Health Information https://medlineplus.gov/globalhealth.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/34416195/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/34416195
subscription/membership/fee required ClinicalKey https://www.clinicalkey.com/content/playBy/pii?v=S0140-6736(21)01207-1