1. Jagiellonian University Medical College; Faculty of Health Science; Krakow Poland
2. Jagiellonian University Medical College; II Department of Internal Medicine; Krakow Poland
3. The University Hospital in Krakow; Krakow Poland
4. Jagiellonian University Medical College; Department of Hygiene and Dietetics; Systematic Reviews Unit - Polish Cochrane Branch; Kopernika 7 Krakow Poland 31-034