JOHN Hartson always put his head in where it hurts. So it was no surprise yesterday to hear the former Celtic giant sympathising with calls for greater studies into the link between heading a football and dementia in the wake of the sad loss of Billy McNeill and Stevie Chalmers, two Lisbon Lions who both suffered from that condition in their latter years. “It was really sad news about Stevie,” said Hartson. “I know his daughter Natalie as she’s based in Swansea.


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