1Faculty of Medicine, Al-Quds University, Jerusalem, Palestine
2Faculty of Medicine, Zagazig University, Ash Sharqia Governorate, Egypt
3Faculty of Medicine, Cairo University, Cairo, Egypt
4Department of Paediatric Rheumatology, Palestinian Red Crescent Society Hospitals, Hebron, Palestine
5Department of Paediatric Rheumatology, Al Ahli Hospital, Hebron, Palestine
6Paediatric Department, Faculty of Medicine, Hebron University, Palestine