- Correspondence to Dr Anselm Ting Su, Department of Social and Preventive Medicine, Faculty of Medicine, Centre for Occupational and Environmental Health, University of Malaya, Kuala Lumpur, Wilayah Persekutuan 50603, Malaysia;
- Received December 9, 2012
- Revised March 28, 2013
- Accepted April 8, 2013
- First published May 5, 2013.
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