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NEWS: Roger Dobson Smoking in pregnancy slows growth of baby's head BMJ 2007; 334: 499-c [Full text]

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Observer Bias?

Ifor G Edwards   (12 March 2007)

Observer Bias? 12 March 2007
Ifor G Edwards, Addictions Psychiatrist 5 Boroughs Partnership NHS Trust, Warrington WA2 8WA Send response to journal: Re: Observer Bias?	I hope some power has been given to this finding by "blinding". Can you confirm this? Competing interests: None