There are several things to know about how to search PubMed for clinical trials and this section will discuss three of them:
1) "Publication Type" and "As Topic" for MeSH terms for clinical trials: what are the differences between then and which is the best one to choose for locating clinical trials? (answer: publication type)
2) "Clinical Studies" vs "Clinical Trials" These are two separate filters; which is the best to use, and when?
3) "Epidemiologic Studies." This is an important category that is NOT included in either Clinical Studies or Clinical Trials
