The science of epidemiology has matured significantly from the times of Hippocrates, Semmelweis and John Snow. The techniques for gathering and analyzing<unk>  data vary depending on the type of disease being monitored but each study will have overarching similarities.
Epidemiological method
Epidemiology in Country Practice
Real world data
Diagnosis-related group
Comparison of birth control methods
Phases of clinical research
Patient-reported outcome
Clinical endpoint