Initiation of a Ring Approach to Infection Prevention and Control at Non-Ebola Health Care Facilities — Liberia, January–February 2015 - Nyenswah, T.; Massaquoi, M.; Gbanya, M.; Fallah, M.; Amegashie, F.; Kenta, A.; Johnson, K.; Yahya, D.; Badini, M.; Soro, L.; Pessoa-Silva, C.; Roger, I.; et al. (Centers for Disease Control and Prevention (CDC), 2015)