Basic science research, Clinical research, and Translational (Bench to Bedside + Clinical trials to Population-based implementation) research
Clinical research is a component of medical and health research intended to produce knowledge valuable for understanding human disease, preventing and treating illness, and promoting health. It is broadly divided into the original study (observational and clinical trials) and non-original study (reviews and case-reports).
Original research is usually an observational study, interventional study, or meta-analysis of observational studies or clinical trials. Any study with a definite research hypothesis, methods, analysis planning, data collection, and results is considered as the original study. In comparison to that, non-original studies are the studies lacking a definite research methodology and analysis, eg bibliometric study/literature review, case reports, letter to the editor, etc.
