00474nas a2200157   4500000000100000008004100001100001200042700001500054700001400069700001700083700001500100245017600115300001200291490000700303050000600310       2009                            d1 aWand B.1 aMcAuley J.1 aHunter R.1 aO'Connell N.1 aMarston L.00aThe self-reported aggravating activities of people with chronic non-specific low back pain do not involve consistent directions of spinal movement: an observational study.  a47-51. 0 v55  aY