Effect of COVID-19 pandemic on provision of sexual and reproductive health services in primary health facilities in Nigeria: a cross-sectional study - Babatunde Adelekan; Erika Goldson; Zubaida Abubakar; Ulla Mueller; Audu Alayande; Tellson Ojogun; Lorretta Ntoimo; Bukky Williams; Ibrahim Muhammed; Friday Okonofua (Reproductive Health, 2021)