1. Pediatric Nephrology Unit, Mansoura University Children's Hospital, Egypt
2. Clinical Immunology Unit, Clinical Pathology Department, Mansoura Faculty of Medicine, Egypt
3. Dermatology and Andrology Department, Mansoura Faculty of Medicine, Egypt
4. Department of Rheumatology, Aberdeen Royal Infirmary, UK
5. Department of Pathology, Mansoura Faculty of Medicine, Mansoura University, Egypt