1. Chair of Epidemiology and Preventive Medicine, Department of Hygiene and Dietetics; Jagiellonian University Medical College; Krakow Poland
2. Kleijnen Systematic Reviews Ltd; York UK
3. Department of Surgical Oncology; The Maria Sklodowska-Curie Institute, Oncology Center, Krakow Branch; Department of Anatomy, Jagiellonian University Medical College; Krakow Poland
4. 2nd Department of General Surgery; Jagiellonian University Medical College; Krakow Poland
5. School for Public Health and Primary Care (CAPHRI), Maastricht University; Maastricht Netherlands