|
Classification of design methods (after Wang and Zhang, 1988) [19] |
| Design method |
|
|
| Case report |
| Cross-sectional survey |
| Retrospective study |
| Prospective study |
| Clinical trial |
| basic science study |
Rigby et al. BMC Medical Research Methodology 2004 4:28 doi:10.1186/1471-2288-4-28 |