1. Clinical and Chemical Pathology Department Cairo University Cairo Egypt
2. Gas Chromatography‐Mass Spectrometry laboratory Cairo University Children Hospital Cairo Egypt
3. Pediatrics Department, Pediatric Cardiology Division Cairo University Cairo Egypt
4. Pediatrics Department, Pediatric Neurology and Metabolic Division Cairo University Cairo Egypt
5. Department of Dairy Science Cairo University Giza Egypt
6. Clinical Division and Research Unit of Metabolic Diseases Bambino Gesù Children's Hospital, IRCCS Rome Italy
7. Department of General Pathology October University for Modern Sciences and Arts Giza Egypt