Epidemiology of rubella virus cases in the pre-vaccination era of Ethiopia, 2009–2015 oleh Mekonen Getahun, Berhane Beyene, Kathleen Gallagher, Ayesheshem Ademe, Birke Teshome, Mesfin Tefera, Anjelo Asha, Aklog Afework, Esete Assefa, Yoseph HaileMariam, Yonas HaileGiorgis, Hiwot Ketema, Dejenie Shiferaw, Ayenachew Bekele, Daddi Jima, Amha Kebede