00356nas a2200145   4500000000100000008004100001260002200042100001500064700001400079700001300093700001300106245007800119300000700197050000600204       2006                            d  aSydney, Australia1 aBurnett A.1 aBishop D.1 aMeade A.1 aMaher C.00aBack pain is a major health problem in Australia: Is exercise the answer?  a20  aN