INQUIRER.net: Throat spray and hydroxychloroquine found to reduce risk of COVID-
19 infection—Singapore study.
[1]https://newsinfo.inquirer.net/1423624/throat-spray-and-hydroxychloroquine-fou
nd-to-reduce-risk-of-covid-19-infection-singapore-study

References

   1. https://newsinfo.inquirer.net/1423624/throat-spray-and-hydroxychloroquine-found-to-reduce-risk-of-covid-19-infection-singapore-study