1. Department of Physiology & Medical Physics, Royal College of Surgeons in Ireland, 123 St Stephens Green, Dublin 2, Ireland
2. CARE International in Cambodia (CIC), P.O. Box 537, House 52 Street 352, Phnom Penh, Cambodia
3. Natural Resources and the Environment, CSIR, P.O. Box 395, Pretoria, South Africa
4. Division of Population Health Sciences, Royal College of Surgeons in Ireland, 123 St Stephens Green, Dublin 2, Ireland