Aniqa Ashfaq; Dr Zainab Akhtar; Dr Sarah Arif; Dr Sahrish Jabeen; Dr Awais Latif; Dr Arzoo Fatima. Association of Serum Vitamin D and Ferritin Levels With Disease Activity in Patients With Rheumatoid Arthritis. IJPRT 2026, 16, 7216-7220.