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The international diplomatic effort to push Syria's warring parties to the negotiating table continues, as does the mission to eliminate the Assad regime's stockpile of chemical weapons. But all the while the suffering of Syrian civilians intensifies. HARDtalk speaks to David Nott, a British surgeon who has recently returned from five weeks practising frontline medicine in rebel held Syrian territory. He calls it the most troubling experience in his 20 years of crisis care. In a conflict such as Syria's how much difference can a courageous doctor make?