Simon Pombili Kashihalwa, Lilian Pazvakawambwa and Josua Mwanyekange (2023) “Estimating the Duration of the Sojourn and the Change in Clinical Conditions for HIV Patients Receiving ART Follow-up in Namibia”, Research and Applications Towards Mathematics and Computer Science Vol. 3, pp. 13–30. doi: 10.9734/bpi/ratmcs/v3/5990C.