1. Institute of Biomedical and Clinical Science; Peninsula Medical School; University of Exeter; Exeter; EX2 5DW; UK
2. Department of Pediatrics; University of Heidelberg; Im Neuenheimer Feld 430; D-69120; Heidelberg; Germany
3. Pediatric Endocrine Unit; Maternity and Children Hospital; P. O. Box 25374; Al-Madinah; Saudi Arabia
4. UK Clinical and Molecular Genetics Unit; UCL Institute of Child Health and Great Ormond Street Hospital for Children; 30 Guilford Street; London; WC1N 1EH; UK
5. Department of Pediatrics; Charles University Hospital; Plzen; Czech Republic
6. Division of Metabolic and Vascular Health; Warwick Medical School; Clinical Sciences Research Laboratories; University Hospital; Clifford Bridge Road; Coventry; CV2 2DX; UK
7. Department of Pediatric Endocrinology; Faculty of Medicine; University of Khartoum; P. O. Box 102 Khartoum; Sudan