scrum
...that the rules for a scrum in rugby union were changed in 2007 to try to reduce the number of serious neck injuries to players?
...that the rules for a <b id="mwCG4"><a href="./Scrum_(rugby_union)" id="mwCG8" rel="mw:WikiLink" title="Scrum (rugby union)">scrum</a></b> in <a href="./Rugby_union" id="mwCHA" rel="mw:WikiLink" title="Rugby union">rugby union</a> were changed in 2007 to try to reduce the number of serious neck injuries to players?