A second blow to the head or neck is the major risk facing batsman Steve Smith, should he return to the crease before he is fully recovered.
Such a blow could be catastrophic, according to Dr Adrian Cohen, founder of Headsafe, the leading concussion research and advocacy organisation.
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Jill Margo is based in the Sydney office. Jill has won multiple prizes, including two Walkley Awards and is an adjunct associate professor at School of Clinical Medicine, Faculty of Medicine and Health, UNSW Sydney, Australia. Connect with Jill on Twitter. Email Jill at jmargo@afr.com
