00496nas a2200157   4500000000100000008004100001100001400042700001700056700001600073700001700089700001700106700001300123700002100136245014100157250004000298       2014                            d1 aHopper J.1 aRefshauge K.1 aFerreira P.1 aHübscher M.1 aJunqueira D.1 aMaher C.1 aFerreira Manuela00aHeavy domestic, but not recreational, physical activity is associated with low back pain: Australian Twin low BACK pain (AUTBACK) study.  a12 March 2014 [epub ahead of print]