A retracted study on hydroxychloroquine and news that the coronavirus may be mutating drew reactions Friday night from Fox News medical contributor Dr. Marc Siegel. "So Lancet, with egg on its face, a renowned journal, is suddenly withdrawing this study," Siegel noted during an appearance on "Tucker Carlson Tonight" A database by Surgisphere Corp. of Chicago was used in an observational study of nearly 100,000 patients that appeared May 22 in The Lancet, an influential medical journal. The study tied the malaria drugs hydroxychloroquine and chloroquine to a higher risk of death in hospitalized patients with the virus. The validity...