[1] Sahlgrens Univ Hosp, Res Ctr Endocrinol & Metab, S-41325 Gothenburg, Sweden
[2] Acad Hosp Utrecht, NL-3584 Utrecht, Netherlands
[3] Univ Antwerp Hosp, B-2650 Antwerp, Egeden, Belgium
[4] Pharmacia & Upjohn Inc, Outcomes Res, SE-19287 Stockholm, Sweden
[5] Univ London St Bartholomews Hosp Med Coll, London EC1A 7BE, England
[6] Rigshosp, DK-2100 Copenhagen, Denmark
[7] Univ Heidelberg Hosp, D-6912 Heidelberg, Germany