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Rodolfo 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; Haji Makame Gora; Dr okafor, (2026), Timing of antenatal care initiation, contact frequency, and adverse maternal and perinatal outcomes at a district hospital in Zanzibar, Tanzania: an analytical cross-sectional study, Research Square