Tens of thousands of displaced Syrians have found refuge in the northern province of Idlib, which borders Turkey. It is a stronghold of opposition forces, including Islamist-led rebel groups.

"The situation in Idlib is very bad because many organizations have stopped their support," said Dr Farida, the last obstetrician-gynecologist to be evacuated from rebel-held eastern Aleppo to Idlib earlier this year. The doctors did not use their full names to protect their families from retaliation.

"Many hospitals are closing because their supporters from outside are bored now because it's the seventh year of the revolution. Many of them don't want to come in anymore," she said. She estimated some 3 million people now lived in the area.

The three-doctor delegation from the Syrian American Medical Society Foundation (SAMS) was in Paris and will travel to the Netherlands and Luxembourg to get commitments for medical assistance in the region.

John Dautzenberg, an advocacy manager for SAMS, said it was clear the new U.S. administration's current rethinking on how to distribute aid was affecting other governments and making it more complicated for non-governmental organizations to get funding.