1. The global burden of disease;Murray,1997
2. Non-steroidal anti-inflammatory drugs and elderly patients;Bateman;BMJ,1995
3. Validation study of WOMAC: a health status instrument for measuring clinically important patient relevant outcomes to antirheumatic drug therapy in patients with osteoarthritis of the hip or knee;Bellamy;J Rheumatol,1988
4. Ageing: socio-economic implications for health care in Singapore;Phua;Ann Acad Med Singapore,1987
5. Yearbook of Statistics of Singapore;Cheung,1993