00374nas a2200133   4500000000100000008004100001260003100042100001400073700001600087700001400103700001300117245010300130300000700233       2006                            d  aAmsterdam, the Netherlands1 aMacedo L.1 aHerbert Rob1 aKamper S.1 aMaher C.00aUsing placebo controls in low back pain research. Part 1: Acupuncture, manual therapy and exercise  a56