1 Fairbank JC, "The Oswestry low back pain disability questionnaire" 66 : 271-273, 1980
2 Gibson JN, "The Cochrane review of surgery for lumbar disc prolapse and degenerative lumbar spondylosis" 24 : 1820-1832, 1999
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9 Obremskey WT, "Level of evidence in orthopaedic journals" 87 : 2632-2638, 2005
10 Fisher CG, "Introduction to and techniques of evidence-based medicine" 32 (32): 66-72, 2007
1 Fairbank JC, "The Oswestry low back pain disability questionnaire" 66 : 271-273, 1980
2 Gibson JN, "The Cochrane review of surgery for lumbar disc prolapse and degenerative lumbar spondylosis" 24 : 1820-1832, 1999
3 Petrie A, "Statistics in orthopaedic papers" 88 : 1121-1136, 2006
4 Concato J, "Randomized, controlled trials, observational studies, and the hierarchy of research designs" 342 : 1887-1892, 2000
5 Smith GC, "Parachute use to prevent death and major trauma related to gravitational challenge: systematic review of randomised controlled trials" 327 : 1459-1461, 2003
6 Bombardier C, "Outcome assessments in the evaluation of treatment of spinal disorders: summary and general recommendations" 25 : 3100-3103, 2000
7 Gartland JJ, "Orthopaedic clinical research. Deficiencies in experimental design and determinations of outcome" 70 : 1357-1364, 1988
8 Deyo RA, "Measuring physical and psychosocial function in patients with low-back pain" 8 : 635-642, 1983
9 Obremskey WT, "Level of evidence in orthopaedic journals" 87 : 2632-2638, 2005
10 Fisher CG, "Introduction to and techniques of evidence-based medicine" 32 (32): 66-72, 2007
11 Wright JG, "Introducing levels of evidence to the journal" 85 : 1-3, 2003
12 Wright JG, "Grades of recommendation" 87 : 1909-1910, 2005
13 Schünemann HJ, "Evidence-based orthopaedics: a primer" (413) : 117-132, 2003
14 Carr AJ, "Evidence-based orthopaedic surgery: what type of research will best improve clinical practice" 87 : 1593-1594, 2005
15 Sackett DL, "Evidence based medicine: what it is and what it isn’t" 312 : 71-72, 1996
16 Sledge CB, "Crisis, challenge, and credibility" 67 : 658-662, 1985
17 Cherkin DC, "An international comparison of back surgery rates" 19 : 1201-1206, 1994
18 Roland M, "A study of the natural history of back pain. Part I: development of a reliable and sensitive measure of disability in low-back pain" 8 : 141-144, 1983
19 Benson K, "A comparison of observational studies and randomized, controlled trials" 342 : 1878-1886, 2000