We conducted a national, matched, test-negative, case–control study in Qatar from December 23, 2021, through February 21, 2022, to evaluate the effectiveness of vaccination with BNT162b2 (Pfizer ...

The aim of INTERHEART, a case-control study conducted in > 50 countries, ... Data on medications (prehospital, inhospital, and discharge) and interventions were abstracted from charts.

We conducted a multicenter, nested case–control study of Alzheimer’s disease biomarkers in cognitively normal participants who were enrolled in the China Cognition and Aging Study from January ...