00372nas a2200133   4500000000100000008004100001100001500042700001400057700001600071245012500087300001300212490000700225050000600232       2009                            d1 aVerbunt J.1 aSmeets R.1 avan Geel K.00aIs the fear avoidance model associated with the reduced level of aerobic fitness in patients with chronic low back pain?  a109-17. 0 v90  aY