Influence of Vitamin D Status on Fatigue in Ankylosing Spondylitis - Tekaya, Rawdha; Hamdi, Ons; Jemmali, Ines; Ben Tekaya, Aicha; Rouached, Leila; Saidane, Olfa; Bouden, Selma; Bouzid, Kahena; Mahmoud, Ines; Abdelmoula, Leila (Acta Medica Iranica, 2022)