The Pfizer COVID-19 vaccine has proven 94 percent effective in a study involving 1.2 million people in Israel, the first peer-reviewed real world research confirming the […]
The NHS has administered a covid-19 vaccine to more than 18 million people, a quarter of the UK population, since December—an extraordinary logistical achievement.1But vaccinating everybody […]
Instrumental variable approachIn our study (doi:10.1136/bmj.n156), we used a novel set of methods to combine evidence from previously reported randomized trials that share a common biological…