RT Journal Article SR Electronic T1 Is chloroquine or hydroxychloroquine useful in treating people with COVID-19, or in preventing infection in people who have been exposed to the virus? JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 342 OP 343 VO 42 IS 3 YR 2021 UL http://smj.org.sa/content/42/3/342.abstract AB