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- Dr D S-Q Koh, Department of Community, Occupational and Family Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Block MD3, 16 Medical Drive, Singapore 117597, Singapore; cofkohd{at}nus.edu.sg
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- First published November 16, 2007.
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April 27, 2016
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2007 BMJ Publishing Group