Diagnostic performance of pancreatic cytology with the Papanicolaou Society of Cytopathology system: a systematic review, before shifting into the upcoming WHO international system - Nikas, Ilias P.; Proctor, Tanja; Seide, Svenja; Chatziioannou, Stylianos S.; Reynolds, Jordan P.; Ntourakis, Dimitrios (International journal of molecular sciences, 2022)