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Figure 3 legend was inadvertently transposed with a section of the main text. The correct figure 3 legend is as follows:

Figure 3: Schematic diagram of the scan paradigm of four different task-related functional MRIs (fMRIs) at visits 2, 3 and 4. All task-related fMRIs identically start with a ‘baseline’ rest (60 s, no specific stimulus or task is performed), a ‘baseline’ rating of desire to void and level of pain, a short rest jittered between 7 and 9 s in which blood-oxygen-level dependent (BOLD) activation resulting from motor activity during the previous rating will return to baseline to avoid contamination of …