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. Author manuscript; available in PMC: 2015 Jan 1.
Published in final edited form as: Pain. 2013 Sep 26;155(1):137–149. doi: 10.1016/j.pain.2013.09.020

Table 2.

Distribution of acquisition protocols and subjects across studies.

study protocol Subjects
1 1 26
2 1,2,3 14
3 1,2,3,4 108
4 1,2,3,4 25
5 2,4 16
6 4 7
7 2,3 5