A look at the top medical headlines for the week of April 18, 2021 including: A new study finds COVID-19 was likely circulating undetected for nearly two months before late December 2019. Then, a study indicating weight loss surgery significantly cuts the risk of cancer in people with severe obesity and nonalcoholic fatty liver disease. And finally, a small study finds that early in the lockdown, a weight gain of two pounds a month was pretty typical.
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