J. Achungo, P. Njuguna, and P. Etau, “Prevalence and Factors Associated with Psoriatic Arthritis among Psoriasis Patients on Follow-up at the Dermatology and Rheumatology Units, Kenyatta National Hospital, Kenya”, EAJHS, vol. 8, no. 2, pp. 21-32, Jun. 2025.