Health

FILE - In this Sunday, Dec. 29, 2019 file photo taken from a helicopter shows Ain al-Asad air base in the western Anbar desert, Iraq. The Pentagon said Friday, Jan. 24, 2020, that 34 U.S. troops were diagnosed with traumatic brain injuries suffered in this month's Iranian missile strike on an Iraqi air base, and that half of the troops have returned to their military duties. Seventeen of the 34 are still under medical observation, according to Jonathan Hoffman, the chief Pentagon spokesman.(AP Photo/Nasser Nasser, File)

FILE - In this Tuesday, Dec. 11, 2018, file photo, an egret looks for food along Valhalla Pond in Riverview, Fla. The Trump administration was expected to announce completion as soon as Thursday, Jan. 23, 2020, of one of its most momentous environmental rollbacks, removing federal protections for millions of miles of the country’s streams, arroyos and wetlands. (AP Photo/Chris O'Meara, File)

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A person walks across the skybridge at Providence Regional Medical Center Everett where a man with the first case of coronavirus in the United States is being treated on Tuesday, Jan. 21, 2020, in Everett, Wash. A U.S. resident who recently returned from a trip to central China has been diagnosed with the new virus. Health officials said Tuesday that the man returned to the Seattle area in the middle of last week after traveling to the Wuhan area, where the outbreak began. (Olivia Vanni/The Herald via AP)

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FILE - In this April 30, 2017, file photo, Alex Trebek speaks at the 44th annual Daytime Emmy Awards at the Pasadena Civic Center in Pasadena, Calif. Trebek says he's already rehearsed what he's going to say to the audience on his final show. Trebek, host of the popular game show since 1984, announced last March that he'd been diagnosed with stage 4 pancreatic cancer but will continue his job while still able. In an interview on ABC-TV broadcast Thursday, Trebek said he'll ask the director to leave him 30 seconds at the end of his last taping. (Photo by Chris Pizzello/Invision/AP, File)

In this Nov. 5, 2019 photo, in St. Francis, Wis., Amy Carter looks at her Yorkshire terrier-Chihuahua mix Bentley, who has epilepsy. Carter, gives him CBD, which she says has reduced his seizures. The federal government has yet to establish standards for CBD that will help pet owners know whether it works and how much to give. But the lack of regulation has not stopped some from buying it, fueling a $400 million CBD market for pets that grew more than tenfold since last year and is expected to reach $1.7 billion by 2023, according to the cannabis research firm Brightfield Group. (AP Photo/Carrie Antlfinger)

Confetti falls at midnight on the Times Square New Year's Eve celebration, Wednesday, Jan. 1, 2020, in New York. (Photo by Ben Hider/Invision/AP)

FILE - In this Aug. 7, 2019, file photo, Rep. Elijah Cummings, D-Md., speaks during a luncheon at the National Press Club in Washington. Cummings died from complications of longtime health challenges, his office said in a statement on Oct. 17, 2019. (AP Photo/Patrick Semansky, File)