Rubella transmission and the risk of congenital rubella syndrome in Liberia: a need to introduce rubella-containing vaccine in the routine immunization program oleh Abyot Bekele Woyessa, Mohammed Seid Ali, Tiala K. Korkpor, Roland Tuopileyi, Henry T. Kohar, John Dogba, April Baller, Julius Monday, Suleman Abdullahi, Thomas Nagbe, Gertrude Mulbah, Mohammed Kromah, Jeremy Sesay, Kwuakuan Yealue, Tolbert Nyenswah, Mesfin Zbelo Gebrekidan