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Study design I.
Levin KA. Levin KA. Evid Based Dent. 2005;6(3):78-9. doi: 10.1038/sj.ebd.6400355. Evid Based Dent. 2005. PMID: 16184164
Study design IV. Cohort studies.
Levin KA. Levin KA. Evid Based Dent. 2006;7(2):51-2. doi: 10.1038/sj.ebd.6400407. Evid Based Dent. 2006. PMID: 16858385
Study design V. Case-control studies.
Levin KA. Levin KA. Evid Based Dent. 2006;7(3):83-4. doi: 10.1038/sj.ebd.6400436. Evid Based Dent. 2006. PMID: 17003803
Study design VI - Ecological studies.
Levin KA. Levin KA. Evid Based Dent. 2006;7(4):108. doi: 10.1038/sj.ebd.6400454. Evid Based Dent. 2006. PMID: 17187048
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