STIR Software for Tomographic Image Reconstruction - Efthimiou, Nikos; Mustafovic, Sanida; Brown, Richard; Twyman Skelly, Robert; Deidda, Daniel; Tsoumpas, Charalampos; Falcon, Carles; Jehl, Markus; Borgeaud, Tim; Strugari, Matthew; Khateri, Parisa; Wadhwa, Palak; et al.