[1] Univ KwaZulu Natal, Coll Hlth Sci, Discipline Pharmaceut Sci, Private Bag X54001, Durban, South Africa
[2] Kabarak Univ, Sch Pharm, Dept Pharmaceut & Pharmaceut Chem, Kabarak, Kenya
[3] Univ Gezira, Fac Pharm, Dept Pharmaceut, Wad Madani, Sudan
[4] US Int Univ Africa, Sch Pharm & Hlth Sci, Dept Pharmaceut, Nairobi, Kenya