We were unable to process your request. Please try again later. If you continue to have this issue please contact customerservice@slackinc.com. A test-negative observational study design may be best ...

Medical research is essential for advancing the understanding of health, diseases, and treatments. There are many types of studies that serve different purposes. Medical research, or health research, ...

The U.S. Food and Drug Administration (FDA) has recently issued guidance for sponsors and investigators interested in submitting a non-interventional study, commonly known as an observational study, ...