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The Diamondbacks’ right-hander underwent extensive examinations at the Mayo Clinic after the episode Monday. He was having dinner with his wife at a Phoenix restaurant when he passed out.

“You never want to see anybody go through that,” Shields said. “You just never know what’s going to come out of it. You look at McCarthy, he walked off the field. Next thing you know, they’re doing surgery on him.”

Blue Jays starter J.A. Happ was also struck by a liner against the Rays last month at Tropicana Field and sustained a skull fracture.

Happ was discharged from an area hospital the following day. The left-hander hurt his knee when he fell to the mound and remains on the disabled list.

Rays reliever Jamey Wright feels it is imperative that the issue continue to receive serious review.

“We don’t want somebody getting killed before something is done about it,” Wright said.