1. VOSH International, Willard, Ohio, USA,
2. Optometry, University of Alabama at Birmingham, Birmingham, Alabama, USA,
3. VOSH International, Dallas, Texas, USA,
4. Orbis, Durban, South Africa,
5. MINSA, Managua, Nicaragua,
6. African Vision Research Institute, Durban, South Africa,
7. Brien Holden Vision Institute, Durban, South Africa,