Need for and use of contraception by women before and during COVID-19 in four sub-Saharan African geographies: results from population-based national or regional cohort surveys oleh Shannon N Wood, PhD, Celia Karp, PhD, Funmilola OlaOlorun, PhD, Akilimali Z Pierre, PhD, Georges Guiella, PhD, Peter Gichangi, PhD, Linnea A Zimmerman, PhD, Philip Anglewicz, PhD, Elizabeth Larson, MSPH, Caroline Moreau, PhD