Strengthening routine immunization in Papua New Guinea: implications for post-polio renewal from a cross-sectional provincial assessment of front-line services
C. Morgan, Olga P. M. Saweri, Nicholas Larme, E. Peach, Pele Melepia, Lucy Au, Scoullar JL Michelle, Reza S Mohammad, Vallely M Lisa, B.A. McPake, J. Beeson