Strengthening polio vaccine demand in Ghana: Understanding the factors influencing uptake of the vaccine and the effectiveness of different message frames. oleh Anna-Leena Lohiniva, Anastasia Nurzhynska, Abdul Mueed, Absar Ali, Khadeeja Ahmed, Paul Ayiku, Joshua Amo-Adjei, Yoshito Kawakatsu, Mrunal Shetye, Karen Greiner, Ross McIntosh