Afewerki/Nigusse/ Mekelle University, Mekelle, Tigray, Ethiopia/  afom.te@gmail.com 
Gebremedhin/Gebregergs/ Mekelle University, Mekelle, Tigray, Ethiopia/ bgebrish04@gmail.com 
Mebrahtom/Amaha/ Tigray Regional Health Bureau, Mekelle, Tigray, Ethiopia/ mebhafte@gmail.com  
Tesfay/Hailu/ Tigray Regional Health Bureau, Mekelle, Tigray, Ethiopia/ Tesfayrama@gmail.com 
Mulubirhan/Alemayohu/ Mekelle University, Mekelle, Tigray, Ethiopia/ mulubirhanassefa@yahoo.com 
