RETRACTED: Hydroxychloroquine in the Treatment of COVID-19: A Multicenter Randomized Controlled Study. - Abd-Elsalam S; Esmail ES; Khalaf M; Abdo EF; Medhat MA; Abd El Ghafar MS; Ahmed OA; Soliman S; Serangawy GN; Alboraie M (The American journal of tropical medicine and hygiene, 2020)