Some doctors in the Syrian capital, Damascus, have started working in secret to treat people wounded in the uprising against President Bashar al-Assad's government.
These medics move from house to house, with whatever medical equipment they can get their hands on, seeking to evade detection by the police or security forces.
Many of the wounded say that they fear they will be reported to the security services if they go to a hospital. The medics, too, know they are taking great risks - some say they have been arrested and tortured for treating injured protesters.
Al Jazeera's Laurence Lee reports.