1. Institute of Experimental Pediatric Endocrinology (G.K., L.K., H.B.), Charité-Universitätsmedizin, Berlin, 13353 Germany
2. Institute of Experimental Endocrinology (J.K., L.S.), Charité-Universitätsmedizin Berlin, 13353 Germany
3. Trophogen, Inc (M.S.), Rockville, Maryland 20850
4. Department of Pediatric Endocrinology and Diabetes (A.G.-K.), Charité-Universitätsmedizin, Berlin, 13353 Germany