1. Jagiellonian University Medical College; Chair of Epidemiology and Preventive Medicine; Department of Hygiene and Dietetics; Systematic Reviews Unit; Kopernika 7 Krakow Poland 31-034
2. Kleijnen Systematic Reviews Ltd; Unit 6, Escrick Business Park Riccall Road, Escrick York UK YO19 6FD
3. Jagiellonian University Medical College; 2nd Department of General Surgery; Kopernika Street 21 Kraków Malopolska Poland 31-501
4. Centre of Oncology, Maria Skłodowska - Curie Memorial Institute, Krakow Branch. Department of Anatomy, Jagiellonian University Medical College Krakow, Poland; Department of Surgical Oncology; ul. Garncarska 11 Krakow Poland 31-115
5. University Hospital; Department of Hygiene and Dietetics, Systematic Reviews Unit, Jagiellonian University Medical College, Department of Adult Psychiatry; Krakow Poland
6. Jagiellonian University Medical College; Department of Hygiene and Dietetics, Systematic Reviews Unit; Krakow Poland
7. School for Public Health and Primary Care (CAPHRI), Maastricht University; Maastricht Netherlands 6200 MD