1. Department of Social and Preventive Medicine, Faculty of Medicine, Centre for Epidemiology and Evidence-Based Medicine, Universiti Malaya, Kuala Lumpur, Malaysia
2. Centre of Clinical Epidemiology, Institute of Clinical Research, National Institutes of Health, Shah Alam, Malaysia
3. Department of Clinical Epidemiology and Medical Technology Assessment, Maastricht University Medical Center, Care and Public Health Research Institute (CAPHRI), Maastricht, the Netherlands
4. Department of Radiotherapy and Oncology, Kuala Lumpur Hospital, Kuala Lumpur, Malaysia
5. Subang Jaya Medical Centre, Subang Jaya, Selangor, Malaysia