Survival time and its predictors in preterm infants in the post-discharge neonatal period: a prospective cohort study in Busoga Region, Uganda oleh Charles Opio, MHSR, Richard Malumba, MHSR, Joseph Kagaayi, PhD, Olufemi Ajumobi, Carol Kamya, MPH, Aggrey Mukose, MHSR, Yeka Adoke, PhD, Angela Kisaakye, Peter Waiswa, PhD