Mealey's (February 9, 2016, 2:34 PM EST) -- PHILADELPHIA — Without explanation, the judge overseeing the National Football League concussion multidistrict litigation on Jan. 27 vacated a Dec. 1 order that severed a group of helmet manufacturers from the MDL (In Re: National Football League Players’ Concussion Injury Litigation, No. 2:12-md-02323, E.D. Pa.)....