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http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?CFRPart=312
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http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?CFRPart=56
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4. US Food and Drug Administration (online 1 April 2006) Code of Federal Regulations Title 21 Part 812 [
http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?CFRPart=812
] (accessed 2 February 2007)
5. US Food and Drug Administration regulations relating to Good Clinical Practice and clinical trials [
http://www.fda.gov/oc/gcp/regulations.html
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