00502nas a2200169   4500000000100000008004100001260002000042100001600062700001700078700001200095700001600107700001400123700001300137700002100150245015400171300000700325       2012                            d  aOdense, Denmark1 aFerreira P.1 aRefshauge K.1 aKent P.1 aManniche C.1 aJensen T.1 aMaher C.1 aFerreira Manuela00aDoes the report of a cause for low back pain matter? A comparison of patients who report a cause for an episode of low back pain and those who don't.  a31