I keep hearing around the boards that there are multiple studies that show domestic violence is fairly equal between the sexes. When I search for this study I can't find anything. I've searched this subreddit, and the sidebar, but I can't find anything. Any help?

Edit (sorry rightsbot): I did find this in the FAQ:

A more recent study from 2011 [ of domestic abuse in America] ups the percentage: One in four men have experienced "rape, physical violence and/or stalking" by a partner, and one in seven have experienced "severe physical violence," like beaten with a fist or a blunt object. And a 32-nation study by the University of New Hampshire claims that girlfriends initiate violence equally often as boyfriends do in relationships.

Where is the source for this?