1. Academic Medical Center; Dutch Cochrane Centre; Room J1B-108-2 P.O. Box 22700 Amsterdam Netherlands 1100 DE
2. Academic Medical Center Amsterdam; Department of Internal Medicine; PO Box 22700 Amsterdam Netherlands 1100 DE
3. Academic Medical Centre; Internal Medicine; PO Box 22700 Amsterdam Netherlands 1100 DE
4. Internal Medicine; Slingeland Ziekenhuis; P.O.Box 169 Doetinchem Netherlands 7000 AD