evidence: RETRACTED: Hydroxychloroquine or chloroquine with or without a macrolide for treatment of COVID-19: a multinational registry analysis [...] RETRACTED: Chloroquine or hydroxychloroquine for COVID-19: why might they be hazardous? [...] Retraction—Hydroxychloroquine or chloroquine with or without a macrolide for treatment of COVID-19: a multinational registry analysis