10.1016/S0140-6736(20)31180-6Crossref records a retraction notice for this DOI (field: update-to).
Crossref records a retraction-related field for this DOI (update-to, update-to, update-to, update-to, updated-by, updated-by).
RETRACTED: Hydroxychloroquine or chloroquine with or without a macrolide for treatment of COVID-19: a multinational registry analysis
Lucent called Crossref's public works API for this DOI and read three fields: update-to, updated-by, and relation entries typed is-retracted-by or is-retraction-of. If any of those name a retraction, this page says so and names the field. If none do, it says the metadata carries no retraction-related field as of the check date, never that the paper is "safe" or "clear" of other problems: this checks disclosed integrity signals, not whether a paper's conclusions are correct. If Crossref has no record for the DOI, that is reported as unknown, never as a pass.
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