SCN9A and Pruritus: Devigili Devigili G G Eleopra Eleopra R R Pierro Pierro T T Lombardi Lombardi R R Rinaldo Rinaldo S S Lettieri Lettieri C C Paroxysmal itch caused by gain-of-function Nav1.7 mutation Paroxysmal itch caused by gain-of-function Nav1.7 mutation Pain Pain 2014 2014 155 155 9 9 1702 1702 1707 1707 24820863 24820863