acudeb'Breakthrough finding' offers clues about why certain COVID-19 patients dieverified_publisherLos Angeles Times - By Liz SzaboDr. Megan Ranney has learned a lot about COVID-19 since she began treating patients with the disease in the emergency department in February. But there’s one question she still can’t answer: What makes some patients so much sicker than others? Advancing age and underlying medical problems explain …