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Table 3 Distribution of subjects in study groups in articles where allocation procedure was not specified

From: The effect of spinal manipulative therapy on experimentally induced pain: a systematic literature review

Article Total of subjects SMT groups Control group No treatment
[23] 60 30 30 30
[39] 30 10 10 10
[19] 10 ? ? ?
[31] 15 7 8 -
[33] 18 ? ? ?
[30] 50 19 18 13
[32] 24 ? ? ?