15- Observational and interventional studies
41:10
16- Cross-sectional studies
2:06:44
Sample size calculation for clinical trials and observational studies
17:03
Observational Studies
5:36
Observational Studies
5:21
Biostatistics - Study Types (cross sectional, case control, cohort, case report & case series)
11:36
أنواع البحوث
8:31
Randomized controlled trials شرح مبسط Study Designs (5)
45:35