Characterising innovations in maternal and newborn health based on a common theory of change: lessons from developing and applying a characterisation framework in Nigeria, Ethiopia... oleh Joanna Schellenberg, Krystyna Makowiecka, Tanya Marchant, Wuleta Betemariam, Anuraag Chaturvedi, Laboni Jana, Audu Liman, Bereket Mathewos, Fatima B Muhammad, Katherine Semrau, Sita Shankar Wunnava, Lynn M Sibley, Della Berhanu, Meenakshi Gautham, Nasir Umar, Neil Spicer