Scaling Access to Contraception for Youth in Urban Slums: The Challenge Initiative's Systems-Based Multi-Pronged Strategy for Youth-Friendly Cities oleh Krishna Bose, Kim Martin, Kathryn Walsh, Maheen Malik, Paul Nyachae, Morine Lucy Sierra, Albert Bwire, Denis Sama, Tumaini Kiyola, Vanessa Mitchell, Hawa Talla, Josephat Avoce, Kate Graham, Mukesh Sharma, Devika Varghese, Andrea Ferrand, Victor Imuwahen Igharo, Dorcas Nelson Akila