Harlequins’ Mike Brown out for rest of season with concussion headaches

• England full-back suffering from headaches ‘throughout the day’ • ‘Until he’s symptom free, he won’t resume training,’ say Harlequins • Concussion: Rugby is making progress, but not enoughThe England full-back Mike Brown is unlikely to play again this season because he is continuing to suffer concussion symptoms two months after he was knocked out while playing in the Six Nations.The 29-year-old was involved in a sickening collision with Italy’s Andrea Masi on 14 February but recovered to play in England’s final two games, against Scotland and France. He has suffered further symptoms since h…