EditorialDr. Ariela Marshall, a hematologist at the Mayo Clinic, outside the hospital in Rochester, Minn., May 21, 2020. (Jenn Ackerman/The New York Times)
EditorialDr. Adetola Kassim, left, Lisa Craig's new hematologist, talks her and and her husband, Jeremy, through some test results at Vanderbilt University Medical Center in Nashville, Feb. 27, 2019. (William DeShazer/The New York Times)