Warning: this episode contains descriptions of graphic images that some viewers may find distressing. Last month, two Australian doctors spent two weeks in Gaza treating countless injured Palestinians. Surgeon Sanjay Adusumilli and general practitioner Siraj Sira tell Nour Haydar why they left Sydney to volunteer in the besieged territory, the pain they witnessed and the feelings of guilt on return You can support the Guardian at theguardian.com/fullstorysupport