Theo NCBI: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3326906/
Theo Global Health Trials: https://globalhealthtrials.tghn.org/site_media/media/articles/QAWhat_is_clinical_data_management.pdf
Theo Consulting Inventiv Health: http://consulting.inventivhealth.com/articles/Realizing_the_Promise_of_Clinical_EDC_A_Practical_Guide.pdf
Theo FDA: https://www.fda.gov/downloads/Drugs/GuidanceComplianceRegulatoryInformation/Guidances/UCM070266.pdf