Senior hospital doctors are taking part in their second strike of the year in England in a dispute over pay.
The two-day walkout began at 07:00 BST with NHS bosses warning patients to expect significant disruption.
But as the strike got under way, an analysis by the Nuffield Trust has shed fresh light on their pay levels.
It has found while salaries have not kept up with inflation, NHS senior doctors are still earning more than counterparts in a number of countries.