Before revision: (Though the first case of a fatality from ethylene glycol occurred in 1930 and studies had been published in medical journals stating DEG could cause kidney damage or failure, its toxicity was not widely known prior to the incident.)
After revision: the related(Though the first case of a fatality from ethylene glycol occurred in 1930 and studies had been published in medical journals stating DEG could cause kidney damage or failure, its toxicity was not widely known prior to the incident.)