1 Centre de Coordination des Opérations d'Urgence de Santé Publique, Ministère de la Santé Publique, Yaoundé, Cameroon.
2 Epicentre, Médecins Sans Frontières, Yaoundé BP 12069, Cameroon.
3 Massachusetts General Hospital Center for Global Health, Boston, MA, USA; Harvard Medical School, Boston, MA, USA.
4 Epicentre, Médecins Sans Frontières, Yaoundé BP 12069, Cameroon; University of Yaoundé I, Faculty of Medicine, Yaoundé, Cameroon. Electronic address: yap.boum@epicentre.msf.org.