Registration of observational studies: is it time?.

Willams RJ, Tse T, Harlan WR, Zarin DA

CMAJ. 2010 Oct 19;182(15):1638-42. doi: 10.1503/cmaj.092252. Epub 2010 Jul 19.

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Abstract:

Willams RJ, Tse T, Harlan WR, Zarin DA. Registration of observational studies: is it time?. 
CMAJ. 2010 Oct 19;182(15):1638-42. doi: 10.1503/cmaj.092252. Epub 2010 Jul 19.

PMID | PMCID