Limitations of the research.1. this research as a historical repository, which makes some of the data could not be saved.2. how many patients might not so much sometimes, analyzing data, fewer or different อาจเห็นค if more information could be found that did not differ.3. this research compared between patients who take away from other patients who come from the onkap pull the haven't used drugs tramadol may cause the saw to pull factor is not clear.
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