1. Chair of Epidemiology and Preventive Medicine, Department of Hygiene and Dietetics, Jagiellonian University Medical College, Krakow, Poland
2. Chair of Epidemiology and Preventive Medicine, Department of Epidemiology, Jagiellonian University Medical College, Krakow, Poland
3. Students’ Scientific Group of Systematic Reviews, Jagiellonian University Medical College, Krakow, Poland
4. Department of Radiation Oncology, St Lukas Hospital, Tarnów, Poland
5. Department of Nutrition and the Department of Epidemiology and Biostatistics, Texas A&M University, College Station, Texas, USA; and with the Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada