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Dr. Robert McClelland
“Did I see an entrance wound consistent with that big wound?” he said in the Sixth Floor Museum interview. “I did not.”
He said that the entrance wound for the fatal shot might have been hidden by blood and Kennedy’s hairline, an area, he said, that the trauma team did not inspect as it tried to save the president’s life."
https://www.nytimes.com/2019/09/24/obituaries/dr-robert-mcclelland-dead.html