1. Warsaw Proctology Centre; Saint Elisabeth Hospital; Warsaw Poland
2. Colorectal and Pelvic Floor Unit; Department of General Surgery; Regional Hospital; Treviso Italy
3. Department of General and Oncological Surgery with the Subunit of Vascular Surgery; Lord's Transfiguration Hospital; Warsaw Poland
4. Clinical Department of General and Colorectal Surgery and Multiple Trauma; St Barbara Regional Specialist Hospital No. 5; Sosnowiec Poland
5. Department of Gerontology and Public Health; National Institute of Geriatrics, Rheumatology and Rehabilitation; Warsaw Poland
6. Department of Radiology; National Institute of Geriatrics, Rheumatology and Rehabilitation; Department of Diagnostic Imaging; Second Faculty of Medicine; Medical University of Warsaw; Warsaw Poland