1	MeSH descriptor: [Back Pain] explode all trees
2	dorsalgia
3	backache or "back pain"
4	lumb* pain
5	coccyx or coccydynia or sciatica or spondylosis
6	MeSH descriptor: [Sciatic Neuropathy] explode all trees
7	MeSH descriptor: [Spine] explode all trees
8	MeSH descriptor: [Spinal Diseases] explode all trees
9	lumbago
10	(disc or disk) NEAR/1 herniat*
11	spinal fusion
12	facet NEAR/1 joint*
13	MeSH descriptor: [Intervertebral Disc] explode all trees
14	postlaminectomy
15	arachnoiditis
16	failed NEAR/1 back
17	MeSH descriptor: [Cauda Equina] explode all trees
18	lumb* near/1 vertebra*
19	spinal near/1 stenosis
20	slipped near/1 (disc* or disk*)
21	degenerat* near/1 (disc* or disk*)
22	stenosis near/1 (spine or root or spinal)
23	displace* near/1 (disc* or disk*)
24	prolap* near/1 (disc* or disk*)
25	MeSH descriptor: [Low Back Pain] explode all trees
26	#1 OR #2 OR #3 OR #4 OR #5 OR #6 OR #7 OR #8 OR #9 OR #10 OR #11 OR #12 OR #13 OR #14 OR #15 OR #16 OR #17 OR #18 OR #19 OR #20 OR #21 OR #22 OR #23 OR #24 OR #25
27	exercis*
28	MeSH descriptor: [Exercise] explode all trees
29	MeSH descriptor: [Exercise Therapy] explode all trees
30	MeSH descriptor: [Exercise Movement Techniques] explode all trees
31	MeSH descriptor: [Physical Therapy Modalities] explode all trees
32	McKenzie
33	Alexander
34	William
35	Feldenkrais
36	MeSH descriptor: [Yoga] explode all trees
37	MeSH descriptor: [Recreation] explode all trees
38	MeSH descriptor: [Physical Fitness] explode all trees
39	yoga or pilates
40	Tai Chi or Tai Ji or Taiji or Taijiquan
41	#27 OR #28 OR #29 OR #30 OR #31 OR #32 OR #34 OR #33 OR #35 OR #36 OR #37 OR #38 OR #39 OR #40
42	MeSH descriptor: [Alexander Disease] explode all trees
43	MeSH descriptor: [Williams Syndrome] explode all trees
44	#43 OR #42
45	#41 NOT #44
46	#45 AND #26