thumb In medicine,<unk> is gathering of matter from the body to aid in the process of a medical diagnosis and/or evaluation of an indication for treatment, further medical tests or other procedures. In this sense, the sample is the gathered matter, and the<unk> tool or sampler is the person or material to collect the sample.<unk> is a prerequisite for many medical tests, but generally not for medical history, physical examination and radiologic tests.
Sampling 
Agent study
Sensitivity training
Stratification 
Emerging Themes in Epidemiology
Platform trial
QResearch
Intervention mapping