00456nas a2200181   4500000000100000008004100001260002200042100001600064700001200080700002000092700001700112700000900129700001200138700001300150700002100163245008100184300000900265       2014                            d  aHobart, Australia1 aFerreira P.1 aKoes B.1 aSteffens Daniel1 aLatimer Jane1 aLi Q1 aBlyth F1 aMaher C.1 aFerreira Manuela00aWhat triggers an episode of low back pain? Results of a case-crossover study  app51