1. Henrik Sælan, Social Welfare Department City of Copenhagen, Bernstoffsgade 17, DK-1592 Copenhagen V, Address for offprints: Henrik Salan, M.D. Ph.D. Social Welfare Department City of Copenhagen, Bernstorffsgade 17, DK-1592 Copenhagen V, Denmark
2. Lars Møller, Institute of Social Medicine, University of Copenhagen, The Panum Institute, Blegdamsvej 3, DK-2200 Copenhagen N
3. Anne Køster, The Glostrup Population Studies, Medical Department C, Glostrup Hospital, University of Copenhagen N, Ringvej 57, DK-2600 Glostrup, Denmark