1. Jagiellonian University Medical College; Chair of Epidemiology and Preventive Medicine, Department of Hygiene and Dietetics; Systematic Reviews Unit; Krakow Poland
2. Kleijnen Systematic Reviews Ltd; Unit 6, Escrick Business Park Riccall Road, Escrick York UK YO19 6FD
3. The Maria Sklodowska-Curie Institute, Oncology Center, Krakow Branch; Department of Anatomy, Jagiellonian University Medical College; Department of Surgical Oncology; ul. Garncarska 11 Krakow Poland 31-115
4. Jagiellonian University Medical College; 2nd Department of General Surgery; Jakubowskiego Street 2 Krakow Malopolska Poland 30-688
5. School for Public Health and Primary Care (CAPHRI), Maastricht University; Maastricht Netherlands 6200 MD