Assessing trends and reasons for unsuccessful implant discontinuation in Burkina Faso and Kenya between 2016 and 2020: a cross-sectional study oleh Celia Karp, Solomon Shiferaw, Peter Gichangi, Elizabeth Omoluabi, Assefa Seme, Mary Thiongo, Leigh Senderowicz, Georges Guiella, Linnea Zimmerman, Fredrick Edward Makumbi, Katherine Tumlinson, Brooke W Bullington, Stephanie Chung, Emilia Goland, Simon Kibera