1. Academic Medical Centre; Dept. of Internal Medicine F4-253 PO Box 22660 Amsterdam Netherlands 1100 DD
2. Kleijnen Systematic Reviews Ltd; Westminster Business Centre 10 Great North Way, Nether Poppleton York UK YO26 6RB
3. Academic Medical Centre; Department of Internal Medicine; Melbergdrief g, Room B2-253 Amsterdam North Holland Netherlands 1105 A2