Ain Shams University, National Research Center, Cairo University - Internal Medicine Department, Justus Liebig University Giessen, Unità Operativa di Immunoreumatologia-Area Medicina Clinica Policlinico Universitario Campus Bio-Medico di Roma, University of L'Aquila - Department of Biotechnological and Applied Clinical Sciences, Kerckhoff-Klinik GmbH, Assiut University, Ain Shams University, Fayoum University, Ain Shams University and Tanta University - Rheumatology and Rehabilitation