Analytical observational study.
Clinical case study-Case report.
Genome-wide association study.
Letter to the editor or response
Perspective, opinion, and commentary.
Proof of concept study
In a primary study, the analysis is performed on only one measure, and in a secondary study the analysis is performed on several measures.
see Primary study.
Proof of concept study
More terms and examples A randomized double-blinded clinical trial with a crossover research design.