1. Department of Internal Medicine, Charles Nicolle Hospital, University of Tunis El Manar, Tunis 1068, Tunisia
2. Department of Rheumatology, Mongi Slim Hospital, University of Tunis El Manar, Sidi Daoued, La Marsa 2034, Tunisia
3. Department of Anatomopathology, La Rabta Hospital, University of Tunis El Manar, Tunis 1068, Tunisia