Which test [paired t test or wilcoxen signed rank test]?

#1
I'm trying to compare pain level reduction among 33 survey respondents.

In comparing Pain Level before and after a procedure, 29/33 respondents answered.
In comparing Pain Level 1 week following, 15/33 respondents answered.
In comparing Pain Level 4 week following, 13/33 respondents answered.

Would it be most appropriate to use a wilcoxen signed ranked test to assess for statistically significant reduction in pain level?
 
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