1. Jagiellonian University Medical College; 2nd Department of Internal Medicine; 8 Skawinska St Krakow Poland 31-066
2. Kleijnen Systematic Reviews Ltd; Unit 6, Escrick Business Park Riccall Road, Escrick York UK YO19 6FD
3. School for Public Health and Primary Care (CAPHRI), Maastricht University; Maastricht Netherlands 6200 MD