[18F]-FDG PET in anal canal cancer: a systematic review and meta-analysis. - Mirshahvalad, Seyed Ali; Mesci, Aruz; Murad, Vanessa; Kohan, Andres; Ortega, Claudia; Veit-Haibach, Patrick; Metser, Ur (European Journal of Nuclear Medicine & Molecular Imaging, 2023)