Andrea Gleason feels lucky to be alive. A few weeks ago, she started feeling pains in her chest but didn’t go to the hospital because she was worried about catching Covid-19, or needlessly burdening doctors.

“I pictured the New York scenario with lots of people in the hallways and I didn’t need to be there,” she said. The Walnut Creek, Calif., resident finally went to the emergency room after the pain became unbearable. Doctors discovered that her coronary artery was almost entirely blocked and swiftly fitted a stent. The…

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