By Sophie Huskisson Three former rugby players have already died this year due to historic head trauma, prompting fresh calls for the sport’s rules to be tightened. Former Pembroke RFC player Anthony Hodge, 73, former Salford Red Devils captain Malcolm Alter, 45, and ex-England Rugby League player Peter Glynn, 71, all died in January. And all three were claimants in sport concussion cases, pursuing compensation. All their deaths are believed to be linked to head trauma from when they played. Labour MP Alex Sobel called for Rugby League and Union authorities to follow the example of the NFL Ame…