1. College of Medical Sciences, Ahmadu Bello University, Zaria, Kaduna State, Nigeria
2. Department of Medical Research Circle, Bukavu, DR Congo
3. Jomo Kenyatta University of Agriculture and Technology, Kenya
4. University of Maiduguri, Borno State, Nigeria
5. Atal Bihari Vajpayee Institute of Medical Sciences and Dr Ram Manohar Lohia Hospital, New Delhi, India
6. Yarmouk University, Irbid-Jordan