1. Department of Social and Preventive Medicine , Faculty of Medicine, , Kuala Lumpur 50603 , Malaysia
2. University of Malaya , Faculty of Medicine, , Kuala Lumpur 50603 , Malaysia
3. Centre for Clinical Outcome Research, Institute for Clinical Research, National Institutes of Health, Ministry of Health , Shah Alam 40170 , Malaysia
4. Department of Nutrition , Faculty of Public Health, , Surabaya 60115 , Indonesia
5. Universitas Airlangga , Faculty of Public Health, , Surabaya 60115 , Indonesia
6. The Centre for Population Health (CePH), Department of Social and Preventive Medicine, Faculty of Medicine, University of Malaya , Kuala Lumpur 50603 , Malaysia
7. School of Chiropractor, AECC University College, Parkwood Campus , Dorset BH5 2DF , UK