Mohammed Mousa Saeed Alghamdi , Abdulaziz Abdullah Alyahyan , Roaa Nawaf Bogis , Fahad Menahi Alotaibi , Sameer Ahmed Razen Alsaadi , Mohammed Hamdan Salem Alghamdi, and Mohammed Jaber Hossain Azyabi , Sultan Hamad Ahmed Awaji , Majed Abdullah Mutlaq Al-Otaibi , Abdullah Mohammed Mohammed Alqarni , Ali Mousa Almuntashiri , Saleh Omar Almaashi. “Serum YKL-40 Levels In Patients With Rheumatoid Arthritis And Its Relationship With Disease Activity”. Migration Letters, vol. 19, no. S2, Mar. 2022, pp. 707-13, https://migrationletters.com/index.php/ml/article/view/10055.