1. Andrology Center (J.N.F., S.A.), Huddinge, Karolinska Institutet, S-141 86 Stockholm, Sweden
2. Department of Medicine (J.N.F., K.L., N.M., E.D., K.W., M.R., S.A., P.A., I.D.), Huddinge, Karolinska Institutet, S-141 86 Stockholm, Sweden
3. Institut National de la Santé et de la Recherche Médicale (P.D., A.B.), Unité 858 and Université Toulouse III Paul Sabatier, Institut de Médecine Moléculaire de Rangueil, 31432 Toulouse, France
4. Department of Surgical Sciences (P.B.), Uppsala University Hospital, SE-751 05 Uppsala, Sweden, and Yale Endocrine Neoplasia Laboratory, Yale University School of Medicin, New Haven, Connecticut 06520
5. Section of Endocrinology, Diabetes, and Nutrition (S.B.), Boston University School of Medicine, Boston, Massachusetts 02218