Did you read the New England paper? They specifically measured serum levels, did a very thorough sub group analysis (including ethnicity and many other possible factors), broke down the supplementation by dosage.
Could you cite the paper you mean?
Sorry here it is:
http://www.fp.ucalgary.ca/FMResidentSecure/Articles/Ca%20vit%20d%20and%20ca%20colon%20nejm%20feb%202006.pdf
Could you cite the paper you mean?
Sorry here it is:
http://www.fp.ucalgary.ca/FMResidentSecure/Articles/Ca%20vit%20d%20and%20ca%20colon%20nejm%20feb%202006.pdf