Outcomes of percutaneous cholecystostomy in elderly patients: a systematic review and meta-analysis - Markopoulos, George; Mulita, Francesk; Kehagias, Dimitris; Tsochatzis, Stylianos; Lampropoulos, Charalampos; Kehagias, Ioannis (Gastroenterology Review/Przegląd Gastroenterologiczny, 2021)