1. HEU, Centre for Health Economics, The University of the West Indies, St. Augustine, Trinidad and Tobago.
2. Department of Economics, The University of the West Indies, St. Augustine, Trinidad and Tobago.
3. Send correspondence to Charmaine Metivier, Charmaine.Metivier@sta.uwi.edu
4. George Alleyne Chronic Disease Research Centre, The University of the West Indies, Bridgetown, Barbados.