1. Health Research Development Unit, University Malaya
Medical Centre, Kuala Lumpur, Malaysia,
2. Health Research Development Unit, University Malaya
Medical Centre, Kuala Lumpur, Malaysia
3. Department of Social and Preventive Medicine, University
Malaya Medical Centre, Kuala Lumpur, Malaysia
4. Department of Medicine, University Malaya Medical Centre,
Kuala Lumpur, Malaysia
5. Department of Psychological Medicine, University Malaya
Medical Centre, Kuala Lumpur, Malaysia
6. Institute of Psychiatry, King's College, London