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Bibliography:Correspondence to:
 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@nus.edu.sg
local:0640202
href:oemed-64-202.pdf
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ark:/67375/NVC-9K7739TZ-X
PMID:17339296
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:1351-0711
1470-7926
DOI:10.1136/oem.2006.026567