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Authorsâ reply
BMJ 341(v09 1):c6340 (2010)
DOI: 10.1136/bmj.c6340
Version: za2963e q8zae q8zb6 q8zcc q8zd3 q8ze4 q8zf6 q8zg1
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BMJ 341(v09 1):c6340 (2010)
DOI: 10.1136/bmj.c6340