Wanja, T., Njoroge, K. and Osoro, E.N. 2021. Factors influencing upward referral system of patients in Nairobi County. International Journal Of Community Medicine And Public Health. 8, 10 (Sep. 2021), 4759–4766. DOI:https://doi.org/10.18203/2394-6040.ijcmph20213646.