Working PaperTiming of antenatal care initiation, contact frequency, and adverse maternal and perinatal outcomes at a district hospital in Zanzibar, Tanzania: an analytical cross-sectional studyRodolfo Isidro Bosch Bayard¹, Salma Abdi Mahmoud, Fahart Jaffar Mfaume, Jorge Bosch Bayard, Chukwuma J. Okafor, Diane Millo Martin, Alberto Luis Caro Rodriguez, Haji Machano Haji, +2 moreResearch Square2026DOI