Doctors treat an injured civilian in a field hospital after what activists said was shelling by forces of Syria's President Bashar al-Assad in the Douma neighbourhood of Damascus, Eastern Ghouta, Syria in this November 19, 2015 file photo. Douma in Syria, an area controlled by rebels fighting to topple President Bashar al-Assad, has been shelled continuously for the past three years. The injured are taken to basements and shelters transformed into field hospitals run by medical staff who have stayed in the battered neighbourhood of Damascus. REUTERS/Bassam Khabieh PICTURE 1 OF 37 - SEARCH "KHABIEH HOSPITAL" FOR ALL IMAGES