[1] Debre Markos Univ, Debre Markos, Ethiopia
[2] Univ Gondar, Gondar, Ethiopia
[3] Amhara Publ Hlth Inst, Bahir Dar, Ethiopia
[4] Ethiopian Publ Hlth Inst, Addis Ababa, Ethiopia
[5] Arba Minch Univ, Arba Minch, Ethiopia
[6] Wollo Univ, Dessie, Ethiopia
[7] Inst Trop Med Antwerp, Antwerp, Belgium