The noninvasive quantitative flow ratio (QFR) approach showed substantial agreement with the more invasive classical fractional flow reserve approach in the DECISION QFR study.
There has so far been no evidence to support the claim that emerged earlier this week that Russian forces used chemical weapons to flush out a group of Ukrainian fighters in Mariupol, but U.K. and U.S. officials say they are investigating. We talked to several experts about how to evaluate and investigate such claims.
TOKYO - Japan on Wednesday widened Covid-19 curbs to the capital Tokyo and a dozen regions covering half the population as the Omicron variant of coronavirus drove record new infections. Already in effect in three regions, the measures, set to run from Friday until Feb 13, were made official by Prime Minister Fumio Kishida after getting the sign-off from an.