Title: The Infection That’s Silently Killing Coronavirus Patients
link: https://www.nytimes.com/2020/04/20/opinion/coronavirus-testing-pneumonia...
Title: What Is a Pulse Oximeter, and Should You Buy One for Coronavirus?
link: https://thewirecutter.com/blog/coronavirus-pulse-oximeter/
Title: Why don’t some coronavirus patients sense their alarmingly low oxygen levels?
link: https://www.sciencemag.org/news/2020/04/why-don-t-some-coronavirus-patie...
Title: Coronavirus: Irish doctors devise early-warning system
link: https://www.irishtimes.com/news/ireland/irish-news/coronavirus-irish-doc...