I want to know the answer to the following question:
What did an analysis of the 13 studies of pain treatment conclude about the effect of real treament versus sham treatments?
All the background I'm provided with is that "There is interest in the relationship between vitamin D and pain, but the evidence so far from controlled trials for such a relationship, other than in osteomalacia, is unconvincing.". Is that enough to answer the question?
Answer: no