Prevalence and Severity of Lower Gastrointestinal Symptoms amongst Non-Dialysis Chronic Kidney Disease Patients: A Systematic Review and Meta-Analysis. - Ruszkowski, Jakub; Majkutewicz, Katarzyna; Heleniak, Zbigniew; Witkowski, Jacek M.; Dębska-Ślizień, Alicja (Journal of Clinical Medicine, 2022)