1. Caribbean Institute for Health Research, The University of the West Indies, Mona; Epidemiology Research Unit; Kingston Jamaica
2. Queensland Health; Allied Health Research Collaborative; Level 3 15 Butterfield Street Herston, Brisbane Queensland Australia 4029
3. University of the West Indies, Mona; Tropical Medicine Research Institute; Mona Kingston St Andrew Jamaica
4. Queensland Health; Department of Podiatry, West Moreton Health Service District; Ipswich Hospital Chelmsford Avenue Ipswich Queensland Australia 4305
5. University of West Indies; Epidemiology Research Unit; Mona Kingston 7 Jamaica
6. University of Ottawa; Bruyère Research Institute; 85 Primrose Street Ottawa ON Canada K1N 5C8